His Work with Hickories

Among the hickories, there was the Stanley from Indiana in 1916, which was quite a favorite with Mr. Jones for some time. But did any one ever see a shellbark that bore well and filled the nuts? Shellbark trees are beautiful to look at, have enormous leaves, seven to nine leaflets, but they leaf out early in spring and the flowers are frequently killed back by spring frosts. Part of its flowers are killed outright with too great frequency for it to be worth growing for the nuts. These are very large, the hulls split entirely to the base, and what kernel there is, is of sugar-like sweetness. The shells are mostly thick and the kernels seldom well-filled.

The Glover shagbark hickory, from Connecticut, which was introduced by Mr. Jones in 1918, is undoubtedly one of the best shagbarks yet propagated. The nuts are of medium size and shell thickness. The flavor is very good. Most shagbarks have five leaflets; this one has seven quite as often, and the leaf is about a foot long.

There were other hybrids, or what are supposed to be hybrids. The Pleas hickory, introduced in 1916, was perhaps first successfully grafted by Mr. Jones, but credit for introduction went to the owner of the parent tree, Dr. E. Pleas, Collinsville, Oklahoma. It was a beautiful tree, shapely, with an air of considerable refinement, making it a graceful lawn tree. It bore fairly well, although not heavily. The nuts were thin-shelled and also had thin hulls that split entirely to the base. So far as most laymen are concerned, the Pleas may be but an edible, or semi-edible bitternut. On the grounds of the Plant Industry Station, at Beltsville, Md., there were once two trees of Pleas, but they were given to the Wild Life Service for planting 10 miles away, although there are many native bitternut trees just over the line fence in neighboring woods. We fancied that we could detect bitternut flavor in good shagbarks about the plantings, due to xenia influence, as in the case of chestnuts.

Burlington was another hican first propagated by Mr. Jones, in 1915. It came from eastern Iowa, and for a time was confused with Marquardt, which never was propagated, or apparently not. Burlington makes a fine appearing tree and serves well for ornamental purposes. It bears fairly well while young, but soon develops faulty nuts, few being well-filled and the majority weevil infested. It is also subject to shuck-worm and twig girdler injury.

Mr. Jones once wrote that he had given up with the hickories "in disgust." So far as is known, he never used any stock for hickories other than pecan, which grew well, made good unions and generally outgrew the scions. John Hershey, however, says this is not a good combination, but there are too many trees of Jones' propagation about the country, to accept Hershey's verdict altogether. Carl Weschcke[23], of St. Paul, uses bitternut largely or entirely; if it is a mistake, it will be expensive. Hickories are slow to grow and one gets too few nuts at best. It takes a lifetime to get even small crops, and for our part, we want no bitternuts on the place. Too often shagbarks fail to unite with bitternut and frequently they are short-lived.

In 1916 Mr. Jones propagated and introduced the Beaver hickory, from central Pennsylvania, a supposed bitternut-shagbark cross. It proved of little value and soon disappeared. The Fairbanks from northeast Iowa, a similar cross, was introduced the same year. It was one of the prettiest of all hybrids and stood up about the longest, but it had too much bitterness in the pellicle encasing the kernel and was much subject to weevil injury.

Efforts with Persian Walnuts

Many varieties of Persian (English) walnut were propagated and brought into bearing. Mr. Jones included a majority of the varieties brought into the country from France by Felix Gillet, of Nevada City, Calif., as early as 1870. There were Franquette, Mayette, Meylan, Parisienne, and a cutleaf variety which appears to have had no other name. A California variety of which he thought well for a number of years was Eureka, a western introduction of 1908. He propagated a number of eastern varieties such as Lancaster (Alpine) in 1913, although credit went to Mr. Rush; Boston, from Massachusetts, also in 1913; Ontario, from Canada, in 1914; and probably others. He obtained Chinese walnuts, from P. Wang, Kinsan Arboretum, Shanghai, and sold seedlings at wholesale. These were an Asiatic form of Juglans regia. He limed the soil, and thought the effects were beneficial. In this he was warmly supported by T. P. Littlepage and more recently by growers in Northern Ohio; but lately liming has not been found beneficial in Italy. All in all, however, the Persian walnut was not particularly dependable, and during the last few years the nursery which he left discontinued selling Persian walnut trees. In the East, the trees of older varieties usually were little more than interesting novelties.

He Tried the Chinese Chestnut

The Chinese chestnut was tried for a few years; but as so often happens with this species, nursery trees died badly in winter and Mr. Jones thought it due to blight, a disease which was then sweeping his part of the country, taking its mortal toll of both American and European species. However, blight does not seriously attack young trees and it is more likely that death was caused by a combination of summer drouth and winter cold; but no matter, the trees perished and the result was the same.

First Heartnut Grafts

Mr. Jones tried the butternut and there is still one tree in the experimental planting east of the residence. It is Aiken, from New England, and was first propagated by him in 1918. It proved disappointing. He grafted the first heartnut ever grafted of any kind insofar as is known, the Lancaster, in 1918. The only other heartnut for which he received full credit for first propagation was Faust, obtained from a dentist, Dr. 0. D. Faust, Bamberg, S. C., in 1918. Others that he was doubtless first to propagate, but for which credit went to the owners of the parent trees, were Bates and Stranger in 1919, both from R. Bates, Jackson, Aiken County, S. C., and Ritchie, a Virginia variety found by John W. Ritchie of Flemington, N. J., in 1918.

However, heartnuts are seldom heavy bearers and the trees do not grow large or live long. In Japan the wood is sometimes used for gunstocks but only because better material is unavailable. Heartnuts have practically no market where other kinds of nuts can be had and the trees are much subject to "bunch" disease. To an enormous extent the trees have been sold to unsuspecting people of the South and East as "English" walnuts.

[Footnote 23: See Weschcke's paper, elsewhere in this report.—Ed.]

The Filbert

Mr. Jones had a tree or two of the Turkish filbert, a species sometimes reaching a height of 60 feet and attaining a trunk diameter of three feet or more. Bixby found the species hardy in central New Hampshire. Mr. Jones obtained his seed from three trees in Highland Park, Rochester, New York, which are believed to be the oldest in the country. In some years, the Rochester trees bear freely, while in others there is not a nut. This is a valuable ornamental species, as it is green from early spring till the last thing in fall; specimens must be selected for such use, as often the trees are unshapely. Like all filberts, they are subject to Japanese beetle attack and must be sprayed or otherwise protected in beetle infested zones. Filbert foliage may be destroyed by these insects as many as three times in a summer and the trees die down to the ground. The nuts are too small to be of value; but the wood is white, very hard, and makes good turned articles.

His Greatest Contribution

It was with the filbert that Mr. Jones made his greatest contribution to nut culture. In 1917 he tried crossing European varieties with pollen of the native Rush. There were no results, and he tried again in 1918 with no better luck. In 1919 he reversed the order of crossing and nearly every nut set. He had discovered that native pollen was not effective on European stigmas, but that the reciprocal cross worked. By 1924 he had a fine lot of fruiting plants. The great majority were of no value, but his No. 200 apparently was well worth while. It was named Bixby in 1937, four years after another seedling, No. 91, had been named Buchanan. The explanation of this belated selection is that the soil about the Bixby tree had so eroded that the tree was starved for a time; but with a couple of years of heavy application of stable manure, it came back, so much so that it is now considered the better of the two. Both are rather small as compared with the large filberts of the Pacific Northwest; but when fully mature, they are sweet and agreeable.

After Mr. Jones was gone, the place was managed by his daughter, Miss Mildred Jones. She kept plants of her father's filbert varieties and the best of the crosses. The latter are now called the Mildred filberts, a name applied in Standardized Plant Names to the entire group of crosses between Rush American and any European filbert. Mr. Jones hoped to have these called after himself but there was an old variety of Jones "hazel" and so his own name could not be used. He once sent specimens to Dr. C. S. Sargent of Arnold Arboretum and somehow gained the impression that the name Jones was given to the cross. Later, however, Sargent's successor, Mr. Alfred Rehder wrote that Sargent had not used the name in either correspondence or on specimens placed in the herbarium.

The example of Mr. Jones in breeding filberts has since been followed by others, as the Department of Agriculture, the New York State Agricultural Experiment Station at Geneva, and. Mr. Carl Weschcke of St. Paul, Minnesota. The last has copyrighted his crosses under the designation "hazilbert," which is a good name; but with the issue of Standardized Plant Names in 1942, the name "hazel" was dropped for all members of the family. For a time, an effort was made to distinguish between the two by calling small-fruited ones "hazels" and those with large fruits "filberts," but there is not exact dividing line and so now all are called filberts.

Buchanan and Bixby are the only varieties of Mildred filberts thus far fully released by anyone and although neither variety is entirely hardy in the northernmost parts of the country, they do well as far south as eastern Tennessee. The nuts of both are too small to compete in the market with the large filberts of Oregon and Washington, but that is not the purpose for which they have been bred. It is for home planting, a use for which they are admirably adapted. Neither variety should be judged until after they have cured fully, at least a month or more. Then the flavor is excellent.

Of the various introductions made by Mr. Jones, the ones most likely to endure are the Ohio black walnut, the Glover shagbark hickory, and the Mildred filberts. The first has already lasted 32 years; the second 30 years; and the Mildred filberts are only nicely started.[24]

[Footnote 24: Except for the last two paragraphs, this paper was read and approved by Miss Mildred Jones in Pavilion, N. Y., on September 2, 1948. The following day, or September 3, she became Mrs. Wesley Langdoc, of P. O. Box 126, Erie, Illinois.]



Mr. Reed Comments on Seedling Trees

Editor's Note: The next two paragraphs should be read in connection with the "Round Table" on chestnut problems, elsewhere in this volume.

In a broad sense, it must be remembered that every variety of seedling tree, of any species and every hybrid form that has ever been planted, or grafted on another tree, has been worth something. This is still a free country and every man has the inalienable right to plant whatever he pleases. Even the hybrids of various forms, hickory, walnut, and chestnut, are all worth something. All are trees and it is better to plant a poor kind of tree than not to plant anything, particularly if it is a nut tree. Whatever prompts a man to plant a tree is worth while.

Hybrid chestnuts bred by crossing Chinese chestnuts of unknown performance record as to habit of bearing, size or flavor of nut, shape of tree, resistance to blight, or spring freezes, and other characteristics which combine to make good nuts, with the inferior and largely inedible Japanese chestnuts, are unlikely to do the damage to the industry that is sometimes predicted. They are now so mixed up that few will be planted by themselves, and there is considerable evidence that the xenia influence of good Chinese chestnuts with which the trees are being planted will render nuts from these hybrid trees fit to market and eat.



President Davidson: The value of nut trees in Tennessee, then, will be discussed by Mr. F. S. Chance of the Tennessee Agricultural Experiment Station in Knoxville.



The Value of Nut Trees in Tennessee

F. S. CHANCE, Vice-Director, Tennessee Agricultural Experiment Station, Knoxville, Tennessee.

Mr. Chance: Mr. President, ladies and gentlemen: As a representative of the Agricultural Experiment Station of the University of Tennessee I want to say it is a great honor to have this distinguished group meet here in Tennessee, especially on the banks of beautiful Norris Lake, which is one of the tributaries to the dammedest river in the country. We are something like 600 miles from the Gilbertsville Dam, or Kentucky Dam near Paducah, Kentucky, and this area here is the beginning of a chain of lakes that run just about that far.

For those of you who are from a distance, you may know that in making a chain of lakes out of this great Tennessee Valley that we covered up lots of good land. We have developed lots of good power. Now, I am not just sure why I was put on this program, because, really I am not a nut tree specialist, as I see most of you people are. I will admit that I have been associating with experimentation for the last eight or ten years and have become slightly nutty, but really my big interest is timber. I am still a blockhead. So in discussing and talking with you this morning for a few minutes about the value of nut trees in Tennessee I want you to just keep in the back of your minds that the thing in the timber world that I think is the prettiest when it comes to furniture is black walnut.

So in some plantings that we made several years ago with the help of Spencer Chase at our various substations and at the parent station at Knoxville, when we began to prune those trees I wanted to go to pruning for timber and he wanted to go to pruning for nuts. He won. So as we developed these plantings we are sure that we are going to have some very excellent nut trees.

Tennessee ranging in altitude from something over a mile high down to some 300 or 350 feet at Memphis on the Mississippi gives us a very, very wide range of climate. This wide range of climate gives us the possibility of growing a very wide range of timber trees. A great part of that area is soil from a limestone formation. Nearly all parts of Tennessee are well adapted to the production of the black walnut. The tree as a nut tree has not in the past been looked at with such great interest. However, there are farms in Tennessee that have been purchased with walnut kernels. Over the period of years, why, thrifty families, especially in Eastern Tennessee sections, have gathered up the walnuts in the neighborhood round about, cracked them and sold the kernels and from year to year made certain accumulations of that kind, funds, and saved them with enough in the bank or in the sock to buy a farm. I knew one particular person who bought a nice farm in just that way.

Now, a great many of the people in the same neighborhood did not save their walnuts. These walnuts were gathered from everybody's trees without any objection on the part of anyone. But it was a means of those people getting ahead with their savings from their other farming operations, and this wintertime work that they could put in, why, that kind of thrift is the kind that gets people ahead who want to get ahead and have vision.

I might say a few words about pecans in Tennessee. We have throughout the state quite a few scattered native pecans that are used, especially in all except the more western sections of the state. As a whole they are for home use. Now, in the extreme western section of the state we have a certain amount of seedling pecans, mostly, that produce a considerable income to a limited number of people. In the 1945 census something over 4,000 farms reported some income from pecans—this was mostly in the western section of the state—the value of which was something over $32,000, which at the present time would be a considerable under-valuation.

This tree is found, I might say, throughout the state. I recall a few years ago coming off of the Cumberland Plateau down in Warren County into the cove there around Viola and seeing a beautiful grove of pecans along a stream. I hadn't been through that country before, but I had known a family that lived there, and I stopped at a house to see just what those pecans meant. And there was an old lady on the porch who owned the property, and I asked her some questions about it, and she told me how they got there and knew when they were not there. She had been raised on that place but she said, "I want to show you something." So I went with her around the side yard into the back yard, and she had a couple of pecan trees there that were loaded with pecans until the limbs were hanging over just like pear tree limbs, heavily loaded pear tree limbs. I said, "My, what a crop of pecans you have here. That's really wonderful." Those were the budded pecans, the type that is grown farther south of us. She said, "Just wait a minute, now. I don't know whether I have any pecans or not." I said, "What do you mean?" She said, "If the frost is two weeks later than usual we will have a wonderful pecan crop, if we have a late frost. If we have an early frost we don't have any pecans."

It was quite interesting to me to see that wonderful crop hanging on the tree and yet she wasn't at all assured that anything of value would come from it.

We have on some of our holdings at the University experimental Stations some wonderful Chinese chestnut trees. I can't get overly excited over them, remembering the chestnut as we had it once in Tennessee with the long, slender body, wonderful telephone poles and wonderful timber of other kinds, and to see that a tremendous economic loss has come to this country through disease that was and probably is not controllable. But from the nut standpoint we have at the present time some trees that look as though they are going to be the equal of our own native chestnut that covered Tennessee from the mountain top to the river bank. So we are very much in hope that again Tennessee will have a supply of chestnuts which will be equivalent, probably, to the harvest of chestnuts we once had. However, that's going to be many, many years off.

From the experimental standpoint I have been very much interested in the timber type of tree, hoping that our native chestnut trees, at least one out of the billions, maybe would prove to be resistant. However, watching these growths come up from time to time and attain an age sufficient to produce nuts and then have my hopes blighted by going back the next year and finding that the tree was blighted has become rather discouraging. I hope that some of you people will find just such a tree, one that will bear an excellent nut and at the same time produce excellent timber.

Now I am coming to our big asset in the way of nut trees in Tennessee, as I see it. I was rather interested here in Professor Moore's discussion of the honeylocust, that detestable tree which was such a thorn in my flesh as a child, and having heard someone championing it with such a story as he had, I have heard everything now. Everybody, though, has a champion. Even my mother loved me, regardless.

Black walnut is, as I said in the beginning, native to all sections of the state, and I think that through the collection of the better yielding or better cracking nuts by the Tennessee Valley Authority we are going to find in this crop a very potent asset to the state of Tennessee through the income from sale of nuts. We have in the state about four cracking plants. One of them is located in Morristown. Down in the basin part of the state where walnuts do particularly well, three others are in the city of Nashville. There were something like 10 million pounds of walnuts in the shell delivered in Nashville this last year, yielding about 1,200,000 pounds of kernels. Now, this is no mean return from a crop which was really just gathered up with very, very little attention given to the planting. It is just one of these free crops, so to speak.

If we were to add to that income the great income which we have been receiving through the years from the sale of timber trees, we would run the value of the black walnut into considerable proportions, with income from the sale of black walnuts in the kernel and in timber.

I see no particular reason why that crop cannot be increased ten, twenty or a hundred fold by just a stimulation of interest in the black walnut. I recall back just previous to World War I, or about that time, there was a tremendous demand, as usual, for black walnut for gun stocks. I happened to be free for a month or so at that time so I could give some attention to the purchasing and delivery of both veneer stock and walnut for gun stocks. It was quite interesting to me as I went over a couple of counties in which I made some purchases, to see that someone in the 40, 50 or 60 years back had had a vision of what the walnut tree would be worth to them on their tracts of land and how we were at that time reaping the harvest of the person who had a vision of the value of the walnut tree. A great many of those trees were trees that had been set or walnuts that had been planted years before by some far-seeing person, and it had gone on without any interruption, probably without the slightest bit of protection, until the time that it was needed and desperately needed for economic purposes.

We have some work going on also in connection with the planting of walnuts in pasture fields. The returns from the pasture in the planting of walnut trees have been just practically the same, maybe a little bit better in favor of the walnuts than where we did not have walnuts in the pasture. This work is being conducted down at the Middle Tennessee Agricultural Experiment Station of the University of Tennessee at Columbia. We are using the walnut tree and also the black locust in this experiment. We don't know what the future of it is going to be, but those walnut trees have grown large enough so that they have had to be thinned to keep them from putting too much shade over the ground.

I made a statement several years ago in the presence of quite a distinguished agronomist or horticulturist that I had never seen a walnut tree growing in the open, whether it was in the blue grass region or outside of a blue grass region that did not have blue grass growing under it. He looked at me askance, and I said, "Do you believe it?" "Well, I don't know," he answered.

So we happened to be coming out of Quincy, Florida, up through southern Georgia outside of the blue grass region, and we were both sitting in the back seat of the car. Our driver drove up to a filling station, and I saw this fellow looked up at a walnut tree over in the yard not very far away, in fact, the next yard to the filling station. I somehow or other sensed what he was thinking. He pushed his door open, got out. I pushed my door open, went around the car and followed him. He walked up to that walnut tree, turned around and said, "Well, it's there." He turned around and walked back.

Now, of course, a condition may prevail in dense shade, where that does not happen in young walnut trees, but I just happened to be right. There is a symbiotic relationship between plants—I don't want to get into that subject—but this one thing I am thinking, and that is that the reason why they were able to get this good grazing from under these walnut trees is that there is a relationship there between those two plants that makes it ideal for the production of pasture grass, and blue grass over a great many of our states is our leading grass.

I might say to the gentleman from Virginia that I had a letter from up there a few days ago. I don't know why they wanted to write to me, wanting to know if the walnut tree was a legume. So I presume that that was the reason, that the grass grew very nicely under those trees.

I have taken too much of your valuable time. It certainly has been a pleasure and an honor to be here and talk to you these few minutes. Thank you.

* * * * *

President Davidson: Thank you, Mr. Chance. We will take a short recess.

(Recess taken.)

President Davidson: The meeting will now come to order, please. The embryo development of the black walnut will be illustrated and discussed by Dr. L. H. MacDaniels of Cornell University.

(Paper to appear in next volume.)

Dr. Crane: I was very glad Dr. MacDaniels' paper preceded mine, because it does give you a very much better picture of the development of all of our oily nuts, excepting the filbert and, of course, the almond to some extent. But we take in pecans and the hickories and for the walnuts the situation is quite general.

Now, this paper that I am going to read is one that our staff in nut investigations has been working on for the past twenty or more years, and we feel we know a lot about the growing and the development and filling of nuts. And there is a lot in this paper that I think will be of value to all nut growers regardless of the kind of nuts that we are trying to grow.



The Development and Filling of Nuts

H. L. CRANE, Principal Horticulturist, United States Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Fruit and Vegetable Crops and Diseases.

All nut growers are confronted with the problems involved in the production of nuts of large size with well filled kernels that are "bright" or light colored. Unsatisfactory development and filling of the kernels is more often a cause of complaint by growers than any other single factor affecting nut production. This is because all of our commercial nuts now sold in the shell are priced on a basis of size and the degree to which they are filled. The size and degree of filling of the nuts varies not only from year to year, but from district to district, orchard to orchard, and even in the same orchard, because nuts of one variety may fill well and those of another poorly. This is true even though the kind and variety of nut being produced is grown in a locality usually having suitable climatic conditions for normal nut production.

Climatic Conditions

Prevailing climatic conditions in any locality determine how well a particular kind of nut will fill. For example, the pecan is native to the southern part of the United States and a small area in northern Mexico. In its native habitat the summers are long and the day and night temperatures are uniformly high, with little difference between maximum and minimum daily temperatures. When the pecan is grown under conditions of shorter summers, or where there is a marked difference between night and day temperatures, the nuts do not grow to proper size and the kernels fill poorly, if at all. Although pecan trees are quite hardy and may be grown successfully well north of their native limits, the normal development of the nuts and the filling of them cannot be expected there.

Good examples of the climactic effects can be cited. At Davis, California, the pecan tree grows, flowers, and sets fruit satisfactorily, but the nuts fail to grow to proper size, fill poorly, and may not mature before frost. At Davis there is an average length of growing season of 242 days; the day temperatures are high, but the night temperatures are comparatively low. Pecan trees are hardy even in Connecticut, but the trees fail to bear because of the short growing season and the great difference between day and night temperatures. The pecan is truly a hot weather crop and is not suited for culture under mountainous conditions. On the other hand it cannot be grown under subtropical conditions because of insufficient cold during the winter to meet the chilling requirement of the trees. Under such conditions, tree growth starts very late in the spring, and, although the trees may flower, few nuts may set and those that stick may be very poorly filled at harvest if they mature.

The pecan is probably more exacting in regard to its climactic requirements than are our other kinds of nuts, but the filbert or hazlenut is probably a close second in this respect. The filbert, however, represents the opposite extreme in that it does best under conditions of mild winter and moderate summer temperatures. These differences are pointed out for the reason that many amateur nut growers want to grow certain nuts outside of their native range in places where unsuitable climatic conditions prevail, and they cannot understand why success is not possible.

Growth and Fruiting Habit of Nut Trees

Since the growth and fruiting habits of our different kinds of nut trees are closely related, it is desirable to point out some of these relationships. All of our different species of walnuts, the pecan and all hickory nuts, as well as hazelnuts and filberts, are borne terminally on shoots of the current season. In other words all walnut species, pecan, and all hickory species bear the pistillate flowers that develop into nuts at the terminal end of the shoots produced the same year that the nuts mature. The staminate or pollen-producing flowers of all these species arise from lateral buds on shoots that grew the previous year. In the case of hazelnut and filbert the pistillate flowers are borne in lateral buds on shoots of the previous season, as are also the staminate flowers or catkins. In this case, however, the pistillate flowers are formed and pollinated before the current year's shoot growth is made. Almonds are borne laterally on shoots produced the previous season. All chestnuts are borne laterally on shoots produced the same season as the nuts.

The chestnut bears most of the staminate flowers separately in staminate catkins whereas the pistillate flowers are in mixed catkins, but all are formed laterally on shoots of the current season. The almond, which has perfect flowers, produces these in lateral buds on shoots of the previous year. Both the hazelnut and the almond flower before any current-season growth is made, whereas all of the other kinds of nut trees mentioned produce almost all normal shoot growth before flowering occurs. These differences in growth, flowering, and fruiting habits provide a basis for the explanation of why growth of almond trees, for example, is harder to maintain than is that of walnut or pecan. Flowering and early development of the fruit before shoot growth is made tend to check such growth, so that flowering and fruiting trees will not make as much new growth as they would have made had flowering and fruiting been prevented.

In general, it can be stated that, in the case of bearing trees, the longer the shoot growth and the greater its diameter in proportion to length, the greater is the number of pistillate flowers that may be formed at its terminal. Furthermore, the set of nuts and the size that they attain are in proportion to the length and diameter of the shoots bearing them. In other words, the number of flowers formed, the nuts set, and the size that they attain are directly correlated with the vigor and growth of the trees. As trees attain age, fewer long, strong shoots and more short, weak shoots are formed. Hence the average size of the nuts produced decreases because of the reduction in average shoot growth. Furthermore, under normal conditions, the degree to which the nuts are filled is related to the vigor as it is measured by the length and diameter of the shoots bearing them. Strong, vigorous shoots usually produce the best filled and earliest maturing nuts.

What Is a Nut and of What Does It Consist?

Webster gives a general definition of a nut as "a fruit consisting of a kernel or seed enclosed in a hard woody or leathery shell that does not open when ripe, as in the hazel, beech, oak, chestnut." Technically speaking, it is a hard, indehiscent, one-seeded dry fruit resulting from a compound ovary. In horticultural language the fruit consists of the hard or leathery nut containing a kernel, together with the husk, hull, or bur that surrounds the nut shell. This kernel consists of the embryo plus the endosperm or its remains. In all of our important nuts, such as walnuts, pecans, hickory nuts, almonds, and filberts, the kernel is essentially the embryo with its thickened cotyledons or seed leaves, as the endosperm has been absorbed except for a thin membrane.

At the beginning of its development, growth of the embryo is slow, and in very early stages it is merely a rounded mass of cells. Later, the meristems of the epicotyl (stem or top) and root axis develop, but the whole embryo is still microscopic in size. Still later the cotyledons (seed leaves) start development from the apical meristem and their growth in length is rapid, but they are very thin and follow the contours of the seed coat. Growth in length of the cotyledons may be arrested by unfavorable nutritional conditions during the time of elongation. In such case, the lobes of the cotyledons may not attain the full length of the seed coat, or pellicle, which surrounds them. After the cotyledons have attained full length, growth in thickness begins in the area nearest the epicotyl and proceeds toward the margins. This growth in thickness results from cambium-like meristem with the formation of new cells. The formation of well developed or solid kernels that completely fill the cavity within the shell is dependent upon meristematic activity continuing almost to maturity. The weather conditions, the nutrition of the tree, or other factors that affect the synthesis and translocation of elaborated food materials from the leaves and shoots to the kernels at this time determine the degree to which the cotyledons are thickened, or in other words how well the nuts are filled.

Periods of Development

In the development of the nuts there are three periods or stages: (1) The period of growth in size; (2) the period of nut filling or development of the kernel; (3) the period of maturing.

What takes place during these periods of development determines the size the nuts attain, the degree to which they are filled, and finally the quality at harvest. These three developmental stages are interdependent, because the size of the nuts may affect the degree of filling, and that, in turn, the time and nature of their maturity. They are not entirely separate and distinct but overlap in that there is more or less development of the kernel, varying with the species, while the nuts are growing in size. In general, however, there is not appreciable kernel development until after the nuts have attained approximately full size, except in the chestnut.

The outstanding example of this situation is the pecan. There is practically no growth of the kernel until after the shell of the nut has started to become hard. At that time growth of the embryo, which constitutes the kernel, become rapid. The major portion of the kernel is formed during a period of approximately one month, starting at Beltsville, Maryland about the middle of September. The final stages of filling occur just before the nuts mature, and the first nuts to fall usually have the best filled kernels. Later maturing nuts are generally poorly filled; their shells and kernels are often discolored, and the shucks fail to open properly, if at all.

The development of walnuts, hickory nuts, and filberts, so far as is known, is in all essentials the same as that described for the pecan nut except that the kernel or embryo begins to grow somewhat earlier in the season. However, the major portion of the filling, which consists in the thickening of the cotyledons, takes place late in the season, and only a month or a little more before the nuts mature.

The period of the maturing of the nuts generally closely follows the completion of the filling of the kernels. During this period in the pecan, certain other species of hickory, the Persian walnut, chestnut, and others, food reserves are transferred from shucks, hulls, or burs to the nuts. Abscission layers are formed and shucks, hulls, or burs split open on drying out, thus partially or wholly releasing the nuts. There is a very direct relationship between the degree to which the nuts are filled and their time of and normality of maturing; well filled nuts mature early and normally, whereas poorly filled nuts mature late, if at all, and shucks, hulls, or burs fail to open properly.

Growth in Size

The size of the nuts produced by a tree is determined by a number of factors, one or all of which may operate during the course of the season. These are: (1) Age of tree; (2) position of the nuts on the tree; (3) fertility of the soil and moisture supply, or the nutritional status of the tree; (4) size of the crop borne.

In general, old trees bear smaller nuts than do younger trees. Hence size of nut for a particular variety is only relative. The first few crops produced by a tree usually consist of nuts large in size for the variety; and then, as the tree attains age, nuts become smaller in size. Young trees make longer and thicker shoot growth than do older trees. There is, then, under normal conditions, a direct relationship between the growth made by a tree and the size that the nuts attain. The more vigorous trees not only produce larger nuts than those produced by less vigorous trees, but the hulls and shells of such nuts are thicker and constitute a higher total percentage of the total weight of the fruit.

The position of the nuts on a tree has an important effect on the size that they ultimately attain. In general, the nuts in the top are larger than those nearer the ground; and those on the strongest and most vigorous shoots of the top or lateral branches will attain a larger size under normal conditions than those located on weaker and shorter shoots or on the inside of the tree. Here again there is a direct relationship between growth of the tree and growth in size of nuts. All normal trees make longer and stronger shoot growth in the top than they do on the terminals of lateral branches, and the shortest and weaker shoots as well as the smallest nuts are generally on the lateral branches inside of the tree top.

Fertility of soil and moisture supply determine in large measure both the growth made by the tree and the size of nuts. The nuts borne on trees growing on fertile soils adequately supplied with moisture are generally much larger in size than those borne by trees on infertile soil or soil poorly supplied with soil moisture. Deficiency of either nitrogen, or moisture, or both is particularly effective in limiting the size of nuts produced. Pecans grown under soil conditions in which both nitrogen and moisture were deficient have been known to attain only about one-fourth the size of nuts of the same varieties grown in the same orchard but under conditions of clean cultivation and supplementary nitrogen applications. A prolonged drought during the time that the nuts are increasing in size very frequently causes them to be much smaller than they would have been had the moisture supply been adequate.

The size of the crop borne by a tree determines in a very large measure the size that the nuts attain at maturity. There is generally an inverse relationship also between the number of nuts borne in a cluster on a shoot and the size they attain. In this respect nut crops are little different from apples and peaches, which, too, are sold on the basis of size. In order to produce fruits of large size having a high market value, the crops are thinned in years of a heavy set of fruit. In the case of pecans, for example, thinning the crop at the time the nuts are growing in size on heavily producing trees is a very effective method of increasing the average size of the nuts allowed to remain on the trees. The earlier the thinning is done the more effective it is; however, it will increase the size of the nuts even when done as late as when the shells have started to become hard. No practical and economical method of thinning the crop of nuts has as yet been found; nevertheless it is well to bear in mind that a large crop borne by a tree generally means reduced average size of the nuts at harvest.

Filling or Development of the Kernels

In general, the fruits (nuts) of a nut-bearing tree are what might be termed storage organs. In them are stored mineral elements and such elaborated food materials as carbohydrates (sugars and starch), oil, amino acids, and proteins that have been removed from the leaves and wood of the tree. These materials are stored for future use of the embryo in the nut to sustain respiration, to permit germination, and to maintain the seedling until it has produced enough leaf area to become self-sufficient.

The question may be asked, why is it so important that nuts be well filled? The answer is very simple, because the quality of the oily nuts is determined by how well the kernels are filled. All but one of our most important nuts—almonds, filberts, hickory nuts, pecans, and walnuts—are oily nuts; and well filled kernels contain from 50 to 75 percent or more of oil, depending upon the species. Chestnuts are starchy nuts and contain less than one percent of oil. The relationship between the degree of filling and the composition of the kernel in oily nuts is outstanding, in that the better filled nuts have a higher content of oil and a lower content of protein, carbohydrates, water, and undetermined constituents than do poorly filled nuts. Highest quality of the kernels is directly associated with highest oil content and highest degree of filling. Nut kernels that are poorly filled are often hollow, shrunken, shriveled, and chaffy. When eaten they may taste sweet, but are lacking in the oily flavor characteristic of the particular species of nut eaten. It is only in the best filled nuts that highest quality, flavor, and oil content are found.

The degree to which nuts are filled or how well the kernels are developed at harvest is determined by a rather large number of interrelated factors: (1) Size of crop, or ratio of number of leaves per nut; (2) average size of nuts; (3) condition of leaves; (4) amount of second growth of the trees; (5) size of preceding crop and how well the nuts produced were filled; (6) disease and insect injury to the nuts; (7) weather conditions; (8) heterosis or effect of cross-pollination on embryo size.

Size of crop: Nut growers want their trees to bear large annual crops of nuts. It is very seldom that one hears a nut grower express the opinion that a certain tree is carrying too many nuts for the crop to attain proper size and fill well, yet this is very often the case. Furthermore, the production of a large crop of poorly filled nuts one year is almost certain to result in a light crop or none at all the following year. There is a very close inverse relation between the size of the crop produced and the degree to which the nuts are filled at harvest, namely, the larger the crop the less the nuts will be filled. It has been pointed out above that nuts are storage organs, and the food materials required to grow and fill them must be made in the leaves. When too many nuts are set and carried through to the filling period, in proportion to the number of leaves or the leaf area of the tree, it is not possible for the leaves to synthesize the large amount of food materials required to fill the nuts. In pecans, for example, it has been shown that six to eight leaves are required normally to fill a nut properly and 10 or more leaves per nut if the tree is to flower and set a crop the following year. Other ratios for number of leaves or leaf area exist with other kinds of nuts. It is general experience that large crops of nuts remove such large amounts of food materials and minerals from the trees that a light crop or no crop at all is produced the following year. This is especially true if the nuts are not especially well filled in the "on crop year."

Size of nuts: Almost everyone prefers large nuts to small ones, and that is one reason, why the larger sizes command a higher price on the markets. Many remember how popular the McCallister hican was a number of years ago because of its extremely large size. Such varieties of the pecan as Nelson and Mahan were very popular because the nuts produced were generally much larger than those of other varieties. These varieties remained popular until experience in growing them showed that they were very often poorly filled at harvest. As a general rule, large nuts are more difficult to fill properly than small nuts. This is obvious, because much more food material must be made by the leaves and transported to fill the kernels of large nuts than is required to fill an equal number of nuts of smaller size. In seasons with conditions favorable for both tree growth and growth in size of the nuts, it is often the experience that the nuts are poorly filled at harvest. On the other hand, if the weather is dry during the period in which the nuts are growing in size, they are much more likely to be well filled at maturity. In fact, the writer has seen several instances in which, because of severe drought in the spring, pecans were undersized, yet the kernels developed and filled so well that the shells of the nuts cracked at maturity.

Condition of leaves: To produce well filled nuts, nut trees must bear a large leaf area and the leaves must be in good health and vigor. If they are to produce annual crops, the trees must carry their leaves until cold weather in the late fall, undamaged by insects or diseases. The importance of a large leaf area free from injury or abnormal condition is so great that it can hardly be overemphasized in connection with nut production. It can be definitely stated that under normal conditions the size of the crop produced and the degree to which the nuts are filled is directly related to the leaf area and the length of time it is carried by the tree.

If the leaf area is to be large, the trees must make good, strong, vigorous shoot growth, and this means that proper attention must be given to fertilization to insure that the trees have adequate amounts of nitrogen, potassium, magnesium, zinc, and boron, as well as all other essential elements. The elements mentioned have been found most likely to be deficient in the soils of eastern and southern United States. In those regions their lack may be expected most frequently to limit tree growth or the filling of the nuts because of their effects on the leaves and the consequent inability of the leaves to make food materials. Deficiency of one or more of these elements results in leaves that are not able to make food materials in anywhere near such amounts as do normal leaves well supplied with all essential elements. In severe cases, deficiency of one or more of these elements results in chlorosis of the leaves, still later in leaf scorch, and finally in premature leaf fall. Trees having leaves in such condition cannot be expected to fill the nuts borne by them.

Most nut trees grown about home or farmstead are deficient in nitrogen, as the trees must compete with grass, weeds, shrubbery, or other trees. Frequently there is not enough plant food for all. A deficiency of nitrogen limits the growth and the leaf area carried by a tree. A deficiency of potassium or magnesium very greatly limits the amount of food material made by the leaves and hence greatly decreases the filling and the oil content of the kernels. Zinc or boron deficiency has a similar effect.

Hence, to insure the production of well filled nuts, one must be certain that the trees are well fertilized and that the fertilizer elements applied are in proper balance one with the others.

Injury to the leaves resulting from attacks by diseases and insects is one of the most common and important causes of poorly filled nuts. Every species and variety of tree nut suffers from at least one disease or insect pest that damages the leaves and hence limits or curtails the amount of elaborated food materials they can make. In most cases the fungi or bacteria causing foliage diseases infect the leaves in early spring at the time they are unfolding and growing in size, although the infection may not be noticeable until later. These infected areas, even though they are small and not numerous enough to cause the leaf to fall, seriously impair the functioning of the leaf out of all proportion to the area directly affected. Should the infection be so severe as to cause premature defoliation, the damage will be great even though only a small percentage of the leaves falls. The disease of eastern Mack walnut known as leaf spot, or anthracnose, is one of these defoliating diseases that causes untold damage from poorly filled nuts in the current crop year, and results in a small crop or none at all the following year. The development and spread of these diseases is gradual, and unsuspecting growers do not realize the damage they cause.

On other hand, the injuries caused by such insects as the webworm, the walnut caterpillar, the pecan leaf case-bearer, the Japanese beetle, and others are somewhat spectacular in that the leaves may be partly or completely consumed on portions of the trees. The injury caused by the walnut aphis, the walnut lace bug, the pecan black aphis, and others, on the other hand, is less conspicuous; but the end result is far more serious than it usually is with the leaf eating insects, because the damage caused is more widespread, almost all of the leaves on a tree being affected. These sucking insects are small in size and may be overlooked until premature defoliation takes place. If nut trees are to bear satisfactory crops of well filled nuts, the diseases and insects that attack and cause injury to the leaves must be controlled. Under normal conditions the size of the crop produced, the regularity of bearing, and the quality of the nuts harvested is proportional to the leaf area of normal leaves carried by the tree from early spring until freezing-weather in the fall.

Second growth of the trees: Certain of our nut trees, such as pecan and walnuts, under some conditions have two or perhaps more periods of shoot growth during the same growing season. The first, or main period of growth, starts at the time of foliation in the spring and ends soon after the shoots flower. The second period of growth, if it occurs, may begin any time after the nuts are set, and may end any time later. This second growth seriously affects the filling of the nuts, in that food materials are consumed in producing this second growth rather than in the growth and filling of the nuts. Generally this second growth is not made until late in the season, and it usually follows a period of dry weather, when conditions again become favorable for growth. Usually this is at the time the kernels should be developing, and hence the degree of filling is affected. The seriousness of the effect on the filling of the nuts is largely proportional to the amount and duration of this second growth. A third period of growth may occur later if weather conditions are suitable.

Preceding crop: It has already been pointed out that nuts are storage organs and in their growth and development large amounts of food materials and minerals are removed from the tree. Under conditions of heavy crop production, the reserves of these materials left in the tree at the time of harvest are likely to be very low; and unless the trees are growing on a fertile soil and carry their leaves until frost, these reserves of minerals and elaborated food materials are not likely to be restored. Under such conditions, in the following spring the reserves are low and although there may be enough to initiate flowering and the set of nuts, they are not sufficiently high to produce well filled nuts. It is for this reason that the nuts produced in an "off crop year," even though the crop may be much lighter, may be less well filled than those produced in an "on crop year."

Such nuts as pecans, hickory nuts, and walnuts transfer large amounts of potassium from the tree itself into the shucks or hulls. The kernels of such nuts are high in nitrogen, phosphorus, and magnesium as well as in oil, which is one of the most concentrated food materials and has the highest calorie value. Nitrogen reserves in the trees are readily and rather quickly replaced if adequate amounts are applied, as this element is not fixed by the soil. This is not true of phosphorus and potassium, as they are apparently taken up by the trees much more slowly than is nitrogen. Furthermore, certain soils have a high fixing power for these elements and hence they are slowly, if at all, available.

Insect and disease damage to the nuts: Certain insects and diseases attack the nuts, causing them to be poorly filled at harvest. Although these pests may destroy, or cause a certain percentage of the crop to drop before harvest, and hence serve as a thinning measure, the affected nuts remaining on the tree may not be well filled at maturity. Examples of such insects are the pecan or hickory shuck worm, the walnut husk maggot, and the codling moth. Infestations by these insects occurring before the shells of the nuts have become hard cause the nuts to drop. However, infestations taking place after the nut shells have become hard do not cause the nuts to drop. These late-infested nuts may be poorly filled because the insect larvae mine the hulls or shucks, severing the conducting tissues that transport food materials from the fruit stem or peduncle through the shuck to the kernel. The damage caused not only results in poorly filled nuts but also interferes with the natural separation of the shucks or hulls from the shells.

Examples of diseases that attack the nuts and cause them to be poorly filled at harvest are pecan scab and walnut bacteriosis. Pecan scab may also attack other species of hickory. It is the most destructive pecan disease, causing a high percentage of the nuts on highly susceptible varieties to drop prematurely and those that stick to the tree to be poorly filled at harvest. Walnut bacteriosis or blight is the most important walnut disease in the West and unless controlled causes severe losses from premature drop or from nuts both poorly filled and having discolored kernels at harvest. It is obvious that if large crops of well filled nuts are to be produced, these insects and diseases must be controlled.

Weather conditions: Many growers are inclined to blame the weather for all small crops and poor nut quality because they realize it can have such important effects. In reality its direct effects are generally much less than they are thought to be, and its indirect effects are usually much greater than is usually realized. Weather conditions have a very great effect on the development of insects and diseases and on the damage caused by them, so that most often these are of major importance.

It has already been pointed out that a prolonged drought may adversely affect the size of nuts when it occurs while they are growing in size. Similarly, the degree to which nuts are filled at harvest is affected by the moisture supply during the filling period. A moisture deficiency within the tree probably affects the translocation of food materials to the nuts to a greater extent than it affects leaf functioning, for under such conditions the leaves will withdraw so much water from the developing nuts that the shucks and hulls become wilted. Under conditions of prolonged drought the kernels do not fill properly, maturity of the nuts is delayed, and the shucks or hulls do not open normally.

Under drought conditions the temperatures of the air and of surfaces exposed to the sun are often very high, and this sometimes results in sun-scald or burning of the hulls or shucks. In severe cases the injury extends through the hull or shuck to the shell and kernels. The pellicle, or skin of the kernel, turns brown or amber color, as does the portion of the kernel that has developed at the time of injury. Further development of the affected portion of the kernel is arrested; and on drying it becomes shriveled because of lack of filling. The greatest amount of damage from sunburn occurs on the south and southwest sides of the trees. Little can be done to prevent this type of injury other than to grow good, strong, vigorous trees that bear a heavy dense foliage that shades the nuts.

Heterosis or hybrid vigor: The pistillate flowers of certain nut species, such as the almond, chestnuts, and filberts, must be cross-pollinated with pollen from another variety if satisfactorily crops of well filled nuts are to be produced. These species are self-sterile or self-unfruitful. On the other hand all walnut, pecan, and hickory species are self-fertile and cross-fertile, but may be self-unfruitful because of dichogamy, because they may shed their pollen either before or after the stigmas of the pistillate flowers are receptive to it. In all nut species cross-pollination is generally recommended so as to assure a set of nuts. With cross-pollination a better set of nuts is to be expected than with self-pollination, as well as better filling of the kernels. It has recently been found that when the pistillate flowers of a certain variety are cross-pollinated with a pollen from another definite variety the embryo or nut kernel is larger and better filled. This is a manifestation of hybrid vigor, or heterosis. Heterosis has been found in the chestnut and in the pecan. It likely will be found in other nut species. Some day the principles of selected and controlled parentage underlying hybrid vigor may be utilized in producing superior nuts, as these principals are now so widely used in producing hybrid seed corn.

* * * * *

President Davidson: That paper was so extremely important that I hesitated very much to stop it, but we are already at the point where we should have adjourned. Now, unfortunately, we have some very important things, I think, yet before us, but if the speakers can give their talks from now on in the form of, shall we say, syntheses of the whole thing and give us the conclusions rather than the details, it will be appreciated by us all. Mr. Wilkinson is going to give us a very important talk on what he has done with the propagation of the Lamb curly walnut. Mr. Wilkinson.



The Grafted Curly Walnut as a Timber Tree

J. FORD WILKINSON, Rockport, Indiana

Our native trees are and have always been one of the most valuable resources of this country, and one of the greatest heritages ever to fall to a nation.

Wood has been used by our people since the landing of the Pilgrims, for almost every comfort and purpose in life, from the making of cradles to caskets.

Wood is still one of the principal materials in building homes and furniture, and is used for railroad ties, for paper, and in so many other ways that we could scarcely get along without wood.

The United States is the native home of many species of trees, of which a number are superior in some certain ways for some special purposes. The hickory has no equal for ax handles. As a building-timber where strength and durability are needed the oak ranks among the first. Other species are equally as important for some other uses.

Not to be overlooked are nut trees. They serve the twofold purpose of producing both food for man and wild life, and valuable timber.

Black Walnut Has Great Value

Of the nut tree group, the black walnut is one of the most important. It ranks among the first for lumber, furniture, cabinets, and finishing material. It has no rival in use for gun stocks and airplane propellers; as walnut wood is light, strong, will not get rough, but wears smoother with use. Neither will it splinter when pierced by a bullet. Walnut wood has been largely responsible, at times, for keeping us a nation of free people.

The black walnut tree is an aristocrat of forest and field. It can justly be proud, for no other tree can fill its place. As the late author A. H. Marks said, "Who has not noticed the look of contended usefulness which a nut-bearing tree wears? It is of use to the world and knows it."

Walnuts, like other species of trees, are not all alike, either as to nut production or in the grain of the wood.

The Lamb Black Walnut

Several years ago an unusually highly figured, and very valuable, black walnut tree was discovered by Mr. George N. Lamb, then Secretary-Treasurer of the American Walnut Manufacturers Association of Chicago, Illinois.

When the logs from this tree came into the mill, and their value was realized, Mr. Lamb went to the place where the tree had grown. He secured some twigs from the branches of this top and sent these, as I have been informed, to Dr. Robert T. Morris and Mr. Willard G. Bixby, knowing of their interest in propagating better varieties of nut trees.

This wood had been taken from the top many days after the tree was felled, and so was dry and nearly dead. I believe Dr. Morris succeeded in getting only one graft to grow, and Mr. Bixby two. This variety was then named in honor of Mr. Lamb.

Several years later Mr. Bixby sent me a very small stick of graft wood from one of his trees, from which I made two grafts. One of them grew, giving me a start of this variety. I have annually propagated a few trees of it ever since, though with little encouragement, and even much discouragement from others, including State and U. S. Government authorities.

On one occasion I thought I practically had an order for a quantity of these Lamb walnut trees for a reforestation project. However, the prospective purchaser, before placing his final order, wrote to government authorities, then wrote me as follows:

* * * * *

" ... Sept. 30, 1940 ...

"Following some investigation in connection with the so-called curly walnut varieties, we have been advised by government authorities that these trees do not form, or grow into, a curly walnut tree at any time during the growing stage.

"We took it for granted that the wood formation would be of a curly nature, and for that reason we were interested in that particular variety.

"In view of this information which we have concerning these trees, we would not be interested in growing them as we have plenty of native black walnut here...."

* * * * *

This and other discouragements, from both government authorities and individuals, had about as much effect on me as King George's advice to the American people not to use tobacco; they smoked calmly on, and I continued to propagate Lamb curly black walnut trees.

I have been propagating nut trees since 1910, and have never yet known one of my propagated nut trees to fail to carry the characteristics of the parent tree, as to habits of growth, bark, bud formation, foliage, texture of wood, or quality of nuts. The Deming Purple walnut tree, when asexually propagated, reproduces the purple wood, so I reasoned the Lamb variety would reproduce figured wood. Nature seldom blunders.

Value of Original Lamb Walnut Tree

When I was in Grand Rapids, Michigan, a few years ago, doing some tree work for the late William J. Wallace, he took me a few miles to the location of the original Lamb tree. It was near a small river in a gravel loam soil near Ada, Kent County, Michigan.

The following is an extract of a letter received from Mr. Lamb as to the original tree:

"November 27, 1929

Lamb Figured Walnut— Cut into veneers @ 6 to 18c per sq. ft. (1/28") Use: Furniture Amount of veneers 60627' [Value: $8,637.62 to $10,918.86 (Prewar!)—Ed.] Logs produced: 8' x 21"—144 Log Ft. 6' x 18"— 73 " " 10' x 36"—640 " " 14' x 30"—591 " " 10' x 32"—490 " " Stump —500 " "

2438

Location of tree—Ada, Kent County, Michigan. Location—River flat 20 rods from river. Soil-Gravel loam. Type of tree—Open grown. Shape—-Double stump. Height—40 ft. Figure—Throughout the tree."

Mr. Lamb further states in his letter: "Unquestionably it was one of the most thoroughly figured trees ever discovered, and if figured wood will propagate itself this stock should, certainly should, do so."

He further states, "The figure in this tree was quite apparent, even in the small branches, while the Forest Products Laboratory found evidence of a developing figure in the twigs not over five years old."

The wood specimens I now have on exhibit here were taken from one of my 12-year-old grafted trees that I cut, and in them you will find figure visible to the naked eye, or easily noticeable by touching with a finger, in wood from branches not over 7 years old.

Comparing age at which figure shows in the wood of the two trees, this young tree seems to be developing figure at an early age, as in the parent tree.

My confidence in this outcome had never been shaken by the doubts of others. Few seemed to share this belief with me, and for this reason I have never pushed the sale of Lamb trees. Now I do not hesitate to state that curly figure will reproduce in any propagated Lamb trees, as the evidence before you here is stronger than any argument.

One purpose of the Northern Nut Growers Association is to encourage the perpetuation by propagation of the better varieties of nut trees. I consider the Lamb variety one of the best walnut trees known from a timber point of view, and until a better variety is found I shall continue to propagate Lamb black walnut trees.

Ed. note: The nuts on Lamb trees, as seen at Norris, Tennessee, during this meeting, appear to be of at least average size and have better than average shell structure. They probably would be well adapted to machine-cracking. Thus the Lamb would not be a bad variety to grow for its nuts. Or we could double-work the trees, to have each tree with a good trunk of the Lamb wood growing beneath a fruiting top of any desired walnut variety. One or two of our members already have made a start on this latter scheme of propagation.

Author's Note: The Lamb variety is a rapid and upright grower and should be well adapted as a stock for the purpose suggested.

* * * * *

President Davidson: I don't think one can minimize the importance of what Mr. Wilkinson has done with the Lamb curly walnut. There are possibilities here that are of immense value to those who are interested in timber. Now, I am very, very sorry to put off the rest of this program until this afternoon. Possibly we can work a part of it then. Meantime, we had better adjourn.

Mr. Chase says that he has arranged for a group picture to be taken at the Community Building at one o'clock. Let's everyone be there at one o'clock. That means, of course, that you are going to cut the sandwich and coffee pretty short.

All right, let's adjourn.

(Luncheon recess was taken.)

Tuesday Afternoon Session

President Davidson: Come to order, please. The first speaker on the afternoon program is Mr. Shivery. I think I will get Mr. Chase to say a word.

Mr. Chase: Our next speaker is Mr. George Shivery, Extension Forester for the University of Tennessee, and I know that the interest of this Association is in the planting of improved black walnuts, and I simply can say this man arranged for the planting of more Thomas walnut trees than any other man in the world. George Shivery.



The Black Walnut Situation in Tennessee

GEORGE B. SHIVERY, Extension Forester, University of Tennessee, Knoxville, Tennessee.

Mr. Shivery: Mr. Chairman and members of the Association: I certainly appreciate that compliment made by Mr. Chase, and I want to assure all of you that we certainly are interested in the black walnut in Tennessee. In the past we have had to depend pretty much on the wild black walnut, and we will for years in the future. But we have done everything possible to get distribution on this Thomas improved black walnut which has been propagated here through the efforts of Mr. Chase, Mr. Zarger and other members in his division.

It seems to me that this black walnut kernel industry is sort of a tradition, particularly in East Tennessee. If you have lived in this state as long as I have, you have become curious about its history. Well, in the early days there were no railroads in this state, and commerce moved pretty much by means of wagon team, and the supply center seemed to be Baltimore, Maryland. Now, I can visualize very well that on outbound trips they doubtless carried black walnut kernels, and on the way in, of course, they'd bring clothing and other materials that were not produced here at home.

In the early days they produced tremendous amounts of maple sugar and maple syrup. Doubtless this was consumed at home and nowadays we don't have any evidence of that, because the climatic conditions in New York State and other northern states and New England are much better suited to the flow of the sap. The weather, I believe, is not so changeable up there. Our weather is changeable. We may have a very severe cold week, and then in ten days it will be balmy and pretty weather. We haven't made any effort to bring back the sugar maple industry. We don't consider it economic in this state, because cane sugar in the past has been cheap in price, and then we have another product that some of you may not be familiar with, sorghum molasses. That serves as dessert lots of times in many meals, hot biscuits and sorghum to finish up the meal.

Now, I might mention something about the size of the black walnut industry in this state. We estimate that there are eight million pounds of uncracked whole walnuts produced on the average in a normal crop year in Tennessee, and there is another five million pounds that is never gathered, never hulled, never enters the market, never used, and the value of this crop in a normal year would be around $750,000. That is for the nuts, the fruit, the kernels. If you speak of timber it will amount to $960,000. That is in the form of lumber and veneers, and if you figure that in the form of a log at the shipping point, we'd reduce that figure and say it would be $480,000.

I think to understand this state you have to give some consideration to physiographic regions, and if you will bear with me I'd like to sketch through these regions of the state, because they have a bearing on production of black walnut. Here in the east we have the East Tennessee Mountains, and proceeding westward we have the Great Valley of East Tennessee. It goes all the way down to Chattanooga, up through Bristol, on up through Virginia to Hagerstown, Maryland, all the way up to Harrisburg, Pennsylvania.

We have fine soil, and we also have different kinds of shale in that valley. Then we proceed westward. We come to the Cumberland Plateau, and the elevation of this plateau is around 2,000 feet. It is higher than this valley. Then we cross that and we reach this area (indicating on map). That is what we call the Highland Rim. That is made up of limestone soil of a different character, usually, than that in this East Tennessee valley. That is what we term the Eastern Highland Rim, and this around here (indicating) we term the Western Highland Rim. And this red portion would be the Central Basin in which Nashville is situated. Then you would travel through this central elevation, come up on the Western Highland Rim, and then you come up here and you cross the Tennessee River flowing north. Then you get into West Tennessee.

Now, that is coastal plain soil, and as you approach the Mississippi River here you have a covering of what the Germans call loess, fine, wind-blown material, silt loam. So that very sketchily gives you some idea of the physiographic regions in this state.

Now you want to know where these black walnuts are grown. Well, up about here (indicating the northeast) we have the towns of Greeneville and Rogersville and Morristown and Jonesboro, the counties of Washington County, Greene County, Hawkins County, say, ten counties; radiating around those ten counties you have in the past had great quantities of walnut kernels produced and sold. Now, go on down this valley past Knoxville, and McMinn County (southeast) has some years produced heavy crops of walnuts. So you have heavy production all through the valley.

There's another center, we might term it, of about six counties in this central basin. But I don't want you to get the wrong impression, because walnuts grow in almost any county in this state, but I am mentioning these greater producing areas. And this County of Williamson south of Nashville in years past has sent plenty of walnuts to market. So that's a walnut producing area. And up here in this Highland Rim we have some counties by the name of Pickett and Overton and Clay County. Well, they produce walnuts, and the people up there have in the past cracked out a lot of walnuts. And in Montgomery County they produce walnuts. So the normal trade centers where these walnuts move is really to a great degree here at this town of Morristown in East Tennessee, and Nashville in Middle Tennessee, and this Middle Tennessee center draws from Kentucky. In fact, these four or five large shelling concerns know about the walnuts pretty much all over the entire walnut producing territory.

Through the years the Agricultural Extension Service, University of Tennessee, with which I am connected, has been keenly interested in assisting in any way we can to get additional income out of walnut kernels, and in recent years the whole uncracked walnut. And even though I am a forester I can see the possibilities of this, and we like to carry it along. In fact, I consider walnut as kind of a dual-purpose tree, fine for timber production, also for production of nuts, walnut meats or kernels. You might term it a triple-purpose tree. I don't think there is any better tree than that for a shade tree in pastures, in the field, and around the home, because for one reason it makes what we term in this state a "cold shade," and it is not a hot shade like you get under a sugar maple. The maple has a dense foliage. And as Mr. Chance indicated this morning, walnut is usually associated with blue grass. Blue grass will grow under it.

I guess some of you here remember the years of the depression, and I remember in 1932, for example, we had a heavy crop of black walnuts in the state. Then I believe the price for kernels of 15 cents a pound would have been a good price during that year, and some of them probably sold for less. So if we had the time we would follow through all the years, beginning with 1927, but just to make it as brief as possible, I will leave those out, but I would like to mention the year 1941. It sort of disrupted things in the kernel industry, because at that time the Pure Food and Drug people came in here and set up regulations, and it interfered with the merchandising of these kernels, because the producer had to satisfy certain sanitary regulations, and it really sounded worse than it was. Anyway, it confused our people, and probably that is about the year in which we had this big shift from the production of walnut kernels cracked out at home to a sale of uncracked walnuts to these shelling plants.

Then another year that I think of (we always think of these as walnut crop years) was 1945, and that year we got better prices, probably, than ever before or since, and a lot of our country people were able to sell hulled uncracked walnuts as high as $6 per hundred pounds.

We will continue to be interested in this industry, but, of course, nowadays the wage scale is higher and money is not worth as much as it was in the past, so it really seems to me that in order to get out this crop we just have to try to make the price a little more attractive.

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President Davidson: "We are now going to hear from Mr. Shessler of Ohio, on his method of grafting, and I wish to assure you that he knows what he is talking about. He has done a lot of it.



Grafting Walnuts in Ohio

SYLVESTER SHESSLER, Genoa, Ohio

In 1934 the Ohio Nut Growers Association conducted a black walnut nut contest. I read about it in the Ohio Farmer. As soon as the names of the winners appeared in that publication, each owner was contacted for some nuts from the prize winning trees. Answers were received from nine of the 10 winners. I did not receive nuts from the Hoover tree. The Brown nuts I planted came up in 1935 and the trees are now 22 feet high, with spread of 22 feet, and are 27 Inches in circumference. The Tritten prize nuts were planted in a fence row. These did not come up the first year. The next year I plowed and disked the patch of ground and planted potatoes. To my surprise the Tritten seedlings came up with the potatoes. I let them grow and I now have five trees from these nuts. All of these trees produce nuts which resemble the original Tritten nut and have good cracking quality. One in particular fills out nicely, has a very thin hull, and is a little larger than the original Tritten. I have named it the Shessler. The Brown seedling trees also produce good nuts. The seedling trees from the Cowle nuts produce nuts with rough shells.

Following my nut planting project I began to collect scions from all of the original trees. Mr. Homer Jacobs, of Kent, Ohio, supplied me with scions from the Tritten tree. The next year Mr. Jacobs asked me to send him scions from the Brown tree as he intended to bench-graft some. I have planted nuts along a road 80 rods long, so that I could have many stocks to top-work. I began to graft in 1935, using the seedling trees as stock. I now have 200 seedling black walnut trees, 100 grafted black walnut trees, 25 grafted Persian walnuts, 20 chestnut trees, two "buartnuts," 15 heartnuts, six pecans, one butternut, 20 grafted hickory trees and five persimmons. Some of these trees are planted in orchard form, others are scattered along fence rows.

For grafting, I cut scions so that there is about four inches of two-year-old wood at the base and some one-year-old wood with small matured buds. These small buds will grow, as a rule. The scions are kept in damp sawdust until used. I like the stock to be a half to one inch in diameter. I wait until the trees are in full leaf before I graft. After leafing out the stock does not bleed. If I find that the stock is bleeding hard when I cut back, I wait a few days before grafting. It is a waste of time to graft when the stock is bleeding. I have grafted very early when the bark would not bleed at all. I just dug down into the cambium layer and put in the scion. I tried one Persian and three black walnuts like this and all grew. I use the slot bark method of grafting, as described in Mr. Reed's bulletin [U.S.D.A. Farmers Bull. 1501]. The stock is cut straight across and I put the lower bud just above the bark on the outside. I roughen the bark of the scion that fits just behind the bark of the stock. A small nail is pushed through the bark and scion with the handle of my knife. I generally tie with cord but sometimes when the bark is heavy I do not use cord. A two-pound paper sack with a hole on the earth side is placed over the graft and the sack is tied at the bottom. This serves as a "hot house" and protects the scion from rain. As soon as leaves appear on the scion, the sack is removed and all the new sprouts are broken off below the graft. I put only one scion on each graft. I use Beck's cold wax. It is easy to thin with water and I just flatten a stick for my brush. I never wax the bud but wax scion well on top.

I cannot give an accurate count of my grafting success but estimate that 75 percent of my grafts live. Rather than keep records I use that time to graft more trees. I am not an experimenter—I simply like to have grafted nut trees. My own trees are scattered over a two-mile area. I have grafted trees in Toledo and Grand Rapids. Every Sunday I attend church, then in the afternoon I graft trees. My aim is to try all the promising trees and select the best and weed out the poor ones. I am saving only the trees that bear nuts every year.

In 1947, I grafted the Ohio 1946 prize winning black walnuts. I achieved survival on all except Nos. 5 and 8. The scionwood of these two was in poor condition and I did not think they would live. I also have No. 54 which looks promising to me. I am looking forward to other contests in Ohio and elsewhere so that we can uncover some more superior black walnuts.

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President Davidson: Thank you, Mr. Shessler.

Mr. Slate, will you say a word to us on grafting? That's right along the same line.



Grafting Walnuts in the Greenhouse

GEORGE L. SLATE, State Experiment Station, Geneva, N. Y.

Walnuts have been grafted in pots in the greenhouse at the Experiment Station at Geneva, N. Y. for a dozen years or more and the practice is successful and very useful. This method was adopted for two reasons. First: Under field conditions results are often uncertain, owing to the vagaries of the weather or neglect at a critical time. The inexpertness of the operator made it desirable that the work be done under as favorable conditions as possible, with the hope that a favorable environment might overcome in part the lack of skill. Second: The work can be done in March before the field work begins, whereas field grafting in May would often not get done owing to the pressure of other work at that time. This method is not original with the writer, but is similar to the method used at the East Malling Research Station in England and described by Witt in 1928 [1].

The rootstocks, two year old black walnut seedlings raised from nuts planted in the nursery, are dug in the fall, stored in the nursery cellar until late February or early March, at which time they are potted in six or eight inch pots, depending upon the size of the rootstocks. The roots are cut back so that the plant will fit in the pot. At this time the tops are cut off, leaving the stem about 8 inches high. The pots are placed in a warm house, watered as needed, and in about 10 days the buds begin to break.

The Jones modified cleft graft is used. The stub is cut off at grafting time and the cleft is made by cutting, not splitting, the stock with a large grafting knife. The scion is tied in place with nursery tape, half-inch size, with a short wick leading out of the cleft. The scion is painted with grafting wax.

Care of the Grafted Plant

The pot is set in a propagating frame about 18 inches deep, with bottom heat, and covered with glass, plus lath or cloth shade. An inch of peat in the bottom of the frame is desirable, to hold moisture and maintain high humidity. The temperature of the frame is kept in the eighties, but is not allowed to go above 90 deg.F. Under these conditions of warmth and high humidity, growth activity is rapid and in about two weeks the buds break, although, some may not start for a month. This spring adventitious buds developed on several scions. Many suckers arise from below the graft, and these are rubbed off two or three times a week. As soon as the shoots from the scion are two or three inches long the plants may be removed to a cooler house, where there is less danger of overheating on hot spring days. Later, they go to the cold frame for hardening off, and when danger of frost is over after May 21st, they are set in the nursery for two years. First year growth is not over eight or ten inches, but the second year the plants grow to three or four feet or even more in a favorable season.

The percentage of grafts starting depends largely on the scion wood. Wood cut from vigorous young trees which is grafted the same day will give a 90 percent stand or better, but wood from other sources varies according, to the age and vigor of the tree from which it is cut and the percentage of success may be much less.

This method is useful for small scale operations where a greenhouse is available and it is desirable to do the grafting before outside work interferes with it. For one not skilled in nut tree grafting success is probably more certain than with nursery grafting.

Literature Cited

1 Witt, A. W. The vegetative propagation of walnuts. Ann. Rpt. of the East Malling Research Station 14th and 15th Yrs. 1926-1927 II Supplement pp. 60-64.

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President Davidson: There are plenty of us who don't know much about grafting, and I did want you to hear Mr. Slate's method. It is certainly worth trying and would come at a pleasant time of the year, would be easy to do, and any of us could try it out.

We now should like to hear from Mr. Clarke on Nut Investigations at Pennsylvania State College.



Nut Investigations at the Pennsylvania State College

WILLIAM S. CLARKE, JR., State College, Pennsylvania

Our present work in nut growing at the Pennsylvania State College was begun in 1946. Some work had been started many years ago, and a small number of trees were planted, mostly black walnut; but a site was selected which proved to be very cold and frosty, and most of the trees soon died. Further work had been planned at a later date, but the depression and lack of labor and land prevented us from getting under way then.

When the present project in nut growing was approved, the country was just beginning to recover from the recent war, and materials of most kinds, including nut trees, were very difficult to obtain. Therefore, in order to learn as much as possible about nut trees, we started at the beginning, with the seed. About two bushels of hulled black walnuts were collected from fence-row trees; some were planted out in the ground that autumn, and some were placed in soil in a box and kept over winter on the outdoor porch of the packing house. Some hickory and pecan nuts were bought and also stored in a similar box. The only nuts which grew were those planted out in the ground. They gave us a good germination, while not a single nut stored in the boxes grew.

At the present time we have about 200 black walnut seedlings in the nursery. When they are a year or two older, they will be grafted to several of the named varieties of black walnuts, and those that take will be planted out in a nut orchard. These seedling trees were transplanted after one year's growth. About four or five times as much of the walnut plant was underground in the root as grew above ground where we could see it.

Since the first year's work we have made a few purchases, and planted a few more nut seeds. At the present time we have planted five pairs of named varieties of filberts, four Chinese chestnuts, of which three survive, four Persian walnuts, three of which survive, and two Japanese walnuts. We also have a few seedlings of Turkish tree hazel obtained from nuts sent to us by one of our friends in the state of Washington and a few butternut seedlings grown from nuts of a tree on the college campus.

Future plans include an orchard with many of the named varieties of black walnuts and also, we hope, some of the new hardy strains and selections of the Persian walnut being introduced by the United States Department of Agriculture. Representative specimens of a wide range of nut species will be collected. Some further work on chestnuts and filberts may be attempted if they prove to be hardy here. Plans for the more distant future include studies in soil fertilization and in spraying for disease and insect control.

Cold Injury in 1947-48

This past winter has been very hard on nut trees, and on some other trees as well. In the first place, the cold weather of the autumn began very suddenly after six weeks of uninterrupted warm weather without any cool nights to harden the wood. In late September a few days of cool weather came, and then three nights in five with temperatures near 20 deg.. The walnut foliage and some of the youngest wood turned black. Next came a winter with extremely low temperatures, with the minima ranging from 18 to 23 degrees below zero over our orchard land. Our four Persian walnut trees were killed back to the ground; three of them have sprouted this summer from the roots. Considerable leaf bud killing occurred on Chinese chestnut. One Japanese walnut died back to the ground and has sprouted from the roots. The other tree lost most of its younger wood, but some buds near the base of last season's growth have sprouted out to make a new top. Several specimens of the golden chinkapin (Castanopsis) of the Pacific Coast, which had made one year's growth here, were killed outright.

Most of the terminal buds and youngest wood of our nursery trees of black walnut were killed, but the trees have grown well this year from the lateral buds. In the woods some black walnuts which had been cut down about four or five years ago, and which had made sprout growth now about fifteen feet high, were killed back from two to four feet by the winter. A twenty-year-old Stabler black walnut on our lawn lost many of its top limbs, though the lower limbs survived the winter all right. Some other types of trees were also badly damaged: some locust trees were killed to the ground, and many others were killed to very old wood. A ginkgo tree on our lawn was killed back to the main trunk. This was one of the few times that I have ever seen injury on this species.

One of the five named varieties of filberts, Pal, escaped winter injury. DuChilly and Italian Red each have one good tree and one that was killed back to the ground, but is now sprouting from the roots. Of Medium Long, both trees have been killed way back. One tree of Cosford was killed completely, and the other tree has been badly damaged.

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President Davidson: Thank you, Mr. Clarke. Our family stopped on the way at a shelling plant where they were handling nuts by the ton, not the bushel, just the ton. I am not exaggerating. You have all heard the hill-billy program from Renfro Valley, no doubt, and we have with us today the man who is running that cracking plant and also this hill-billy chorus, Tom Mullins, who will tell us about what he is doing down at Renfro Valley.



Black Walnuts: A New Specialty at Renfro Valley

TOM MULLINS, Renfro Valley, Kentucky

Mr. Mullins: As Mr. Davidson said, I come from a little hill-billy section up in Kentucky known as Renfro Valley. Up until about a year ago the main commodity there was hill-billy music and a lot of noise on Saturday night. About last August our boss there kind of got interested in black walnuts. There were a lot of them going to waste all over the county due to the fact that most of our locals up there are kind of lazy. They don't like to get up there and stomp them out.

His original idea was to set up a hulling plant and hull the nuts and then buy the walnuts from the locals after they were dried. One thing led to another, and we talked to Mr. McCauley there, and Dad bought a big walnut plant to process black walnuts all the way through. He was new to it and so was I. He said, "Let's buy a million pounds of black walnuts." I didn't any more know what a million pounds of black walnuts was than I know how many grains of sand is in three or four buckets. It didn't take me very long, I think it was 31 days, and I bought 1,030,000 pounds. That's a whole lot of walnuts in anybody's language.

One of the local boys on our radio program came up with the bright idea that before in Renfro Valley we used to be just half nuts; now we are walnuts.

We started cracking these things along about the 15th of October, and last Saturday we cracked our last 10,000 pounds. Our machine is capable of cracking approximately 10,000 pounds in an 8-hour shift, and we carry the walnut all the way through to remove any of the field litter that it may have when it is picked up, and through cleaning air blasts and into a cracking machine that does darn near all the work. The only thing we haven't been able to figure out yet is how to get this machine to tell a bad kernel from a good one. We have to leave that to some of the girls who do the work on the picking belts.

Our future plan for this fall is to buy a million and a half pounds this year and process them. I believe one of these gentlemen a while ago mentioned something about the pure food laws. They are pretty rough on us. We have to pasteurize our walnuts. The state law of Kentucky requires 190 degrees of heat for an hour and a half. That's a lot of heat.

We package our nuts in two-ounce packages and in 35 and 50-pound cartons for the wholesale trade.

That has created quite a little industry there in our county. We have one county there, Clark County—Winchester, Kentucky, is the county seat of it—and out of that one county last year alone I bought 800,000 pounds of walnuts. That was, walnuts in the hull that the farmer had picked up and brought to us in trucks.

Our success was not too great in this method of hulling green walnuts to get our supply. We weren't adequately fixed up to dry the walnuts and take care of them in storage. We lost a few of them that way, but I think this year we have a little better sense and will let the farmer stomp them out.

We are working now on an educational program, both newspaper and radio, to persuade the farmers in our locality to let their walnut trees grow. We tell them nearly all the walnut trees will produce enough kernels or shelled walnuts to bring in as much money as they would if cut down and taken to the mill and used for saw logs. That is our main problem now, to try to keep the black walnut industry working there in our community. And our future plans call for plantings of black walnut seedlings and convincing the farmer and the 4-H Club members and all the boys in the Future Farmers of America and organizations like that to protect and cultivate their black walnut trees.

I am kind of on the fence this year. I stuck my neck away out the other day and bought a farm. After checking the farm I found I had about 600 walnut trees. Now, then, I am hollering on one hand for an increase in prices of raw material, and as a sheller I am hollering on the other hand to get the prices down. But I believe as a producer for next year I am going to try to forget about the shelling and let the prices go to the devil.

Mr. McDaniel: Would you mind telling us what you had to pay for the walnuts in the shell?

Mr. Mullins: Our average last year was $4.33. We went as high as $4.80. Some of those we bought hurriedly—

President Davidson: In the hull?

Mr. Mullins: No, that's dry shell. Our walnuts in the hull we paid a dollar and a quarter a hundred for, and if we had had good success we'd have made some money on it at that angle.

There is one question I'd like to put before you gentlemen. Maybe some of you know a little something about it. I was reading an article not long ago in Popular Mechanics Magazine about some plant on the West Coast that is developing the Vitamin C content of the walnut hull itself. It is very high, the Vitamin C content in the walnut hull.

Another thing we did last year. After we hulled all of these walnuts we had a mess of hulls on hand, and our farmers were a little reluctant to come and get them. We tried to talk them into using them for fertilizer. They are kind of like some of the boys, they have got to be shown. They have to see somebody else do it before they tackle it.

Out of curiosity I laid my garden off and divided it in half, and on one half I put a top dressing of these dried-out, pulverized walnut hulls, and I firmly believe that the side that had the walnut hulls on it produced twice as much. And some of the boys in the neighborhood kind of noticed what kind of garden I had, and we don't have any hull problem anymore. They carried them all off.