Читать книгу Growing Nuts in the North - Carl Weschcke - Страница 9

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When I was about fifteen years old, my family moved to St. Paul, Minnesota, where my home now is and where my experimental work with nuts was begun. St. Paul is in the 45th north parallel, but although it is farther north, it is as favorable for the growth of nut trees as New Ulm or St. Peter, because it lies in the Mississippi River valley and is farther east. Bodies of water and altitudes have as great an influence on plant life as latitude; at least, they can have, and these are factors that must be understood thoroughly. Soil conditions also vitally affect plant life, particularly deep-rooted trees such as nut trees usually are. Each has its own requirements; hickory, Japanese heartnut and Persian walnuts favor an alkaline soil, which chestnuts, wanting acid will not grow in; chestnuts thrive best in a slightly acid, well-drained soil; hazels will grow in either alkaline or acid soil as will black walnuts and butternuts; almonds need a light sandy soil, similar to that suitable to plums, pecans do well in either rich river bottoms, which may be slightly acid, or in clay soil on high hillsides which are alkaline. A deep, sandy or graveltype soil is usually accepted by the chestnuts even though it may not be slightly acid, and successful orchards have been grown on a deep clay soil on hillsides.

It is not always easy to obtain black walnuts and butternuts to eat. Hickory nuts have been a favorite of mine since I first tasted them and I often have found it difficult to procure fresh ones, ones that were not slightly rancid. Because I liked eating these nuts, I thought I would try to grow some for my own consumption and so avoid having to depend on a grocer's occasional supply of those shipped in, always a little stale. Raising nuts appealed to me economically too, since obviously trees would need little care, and after they had begun to bear would supply nuts that could be sold at interesting prices.

I turned the back yard of my home in St. Paul into an experimental plot. Here I set out some of each kind of tree I planted or grafted at my farm in Wisconsin. I had purchased a farm 35 miles east of St. Paul, beyond the influence of the St. Croix River Valley. My experiments really began there. The farm was covered with butternut trees, hazel bushes, and a wild hickory called "bitternut." This last is well-named for I have never found an animal other than a squirrel that could endure its nuts. Possibly the white-footed mouse or deer-mouse could—I don't know. He usually eats anything a squirrel does. I learned to appreciate these bitternut trees later and they became a source of experience and interest to me as I learned to graft on them many varieties, species and hybrids of hickory. They served as a root-system and shortened the length of time required to test dozens of hickory types, helping me in that way, to learn within one lifetime what types of nuts are practical for growing in the north.

Remembering the nut trees in southern Minnesota, I first thought to procure black walnut and hickory trees from some farmer in that district. Through acquaintances in St. Peter, I did locate some black walnut trees only to find that it was impractical to dig and transport trees of the size I wanted. A nursery near St. Paul supplied me with some and I bought twenty-eight large, seedling black walnut trees. I was too eager to get ahead with my plans and I attempted, the first year these trees were planted, to graft all of them. My ability to do this was not equal to my ambition though, and all but two of the trees were killed. I was successful in grafting one of them to a Stabler black walnut; the other tree persisted so in throwing out its natural sprouts that I decided it should be allowed to continue doing so. That native seedling tree which I could not graft now furnishes me with bushels of walnuts each year which are planted for understocks. This is the name given to the root systems on which good varieties are grafted.

In an effort to replace these lost trees, I inquired at the University of Minnesota Farm and was given the addresses of several nurserymen who were then selling grafted nut trees. Their catalogues were so inviting that I decided it would be quite plausible to grow pecans and English walnuts at this latitude. So I neglected my native trees that year for the sake of more exotic ones. One year sufficed; the death of my whole planting of English walnuts and pecans turned me back to my original interest. My next order of trees included grafted black walnuts of four accepted varieties to be planted in orchard form—the Stabler, Thomas, Ohio and Ten Eyck.

I ordered a few hickories at the same time but these eventually died. My experience with hickories was very discouraging since they were my favorite nuts and I had set my heart on growing some. I think I should have given up attempting them had not one dealer, J. F. Jones, urged that I buy just three more hickory trees of the Beaver variety. He gave me special instructions on how to prepare them against winter. I have always felt that what he told me was indeed special and very valuable since those three trees lived. Subsequently, I bought several hundred dollars worth of trees from him. More than that, we became friends. I visited him at his nurseries in Lancaster, Pennsylvania, and he again demonstrated his interest and generosity by giving me both horticultural information and the kindest hospitality. My friendship with him was but one of many that I have formed while traveling and corresponding in the interests of nut culture. True and lasting friends such men make, too, with no circumstances of selfish import to taint the pleasure of the relationship.

Since I wanted to have many black walnut trees some day, I decided to plant ten bushels of black walnuts in rows. I thought I could later graft these myself and save expense. The theory was all right but when I came to practice it, I found I had not taken squirrels into consideration. These bushy-tailed rats dug up one complete bed which contained two bushels of nuts and reburied them in haphazard places around the farm. When the nuts started to sprout, they came up in the fields, in the gardens, and on the lawn—everywhere except where I had intended them to be. I later was grateful to those squirrels, though, because, through their redistributing these nuts I learned a great deal about the effect of soil on black walnut trees, even discovering that what I thought to be suitable was not. The trees which the squirrels planted for me are now large and lend themselves to experimental grafting. On them I have proved, and am still proving, new varieties of the English walnut.

The other eight bushels had been planted near a roadside and close to some farm buildings. The constant human activity thereabouts probably made the squirrels less bold, for although they carried off at least a bushel of walnuts, about two thousand seedlings grew. I had planted these too close together and as the trees developed they became so crowded that many died. The remaining seedlings supplied me with root-stocks for experimental work which proved very valuable.

I have always suspected the squirrels of having been responsible for the fact that my first attempt to grow hickory seedlings was unsuccessful. I planted a quart of these nuts and not one plant came up. No doubt the squirrels dug them up as soon as I planted them and probably they enjoyed the flavor as much as I always have.

In 1924 I ordered one hundred small beechnut trees, Fagus ferruginea, from the Sturgeon Bay Nurseries at Sturgeon Bay, Wisconsin. The company was very generous and sent me three hundred of them. I planted these trees in a heavy clay soil with limestone running near the surface. They grew well the first year, except that there was heavy mortality during cold weather. In working with these trees my lack of experience and horticultural knowledge was against me. They could not tolerate the soil and within three years they were all dead.

To give variety to the landscape at my farm, I planted several other kinds of trees. Among these were Kentucky coffee-trees which have beautiful bronze foliage in the spring and honey locusts. I planted five hundred Douglas fir but unfortunately, I put these deep in the woods among heavy timber where they were so shaded that only a few lived. Later, I moved the surviving fir trees into an open field where they still flourish. About two hundred fifty pines of mixed varieties—white, Norway and jack—that I planted in the woods, also died.

I decided, then, that evergreens might do better if they were planted from seeds. I followed instructions in James W. Toumey's "Seeding and Planting in the Practice of Forestry," in bed culture and spot seeding. In the latter one tears off the sod in favorable places and throws seed on the unprotected ground. In doing this, I ignored the natural requirements of forest practice which call for half-shade during the first two to three years of growth. Thousands of seedlings sprouted but they all died either from disease or from attacks by cows and sheep. One should never attempt to raise trees and stock in the same field.

Because of these misfortunes, I determined to study the growth of evergreens. I invested in such necessary equipment as frames and lath screening. Better equipped with both information and material, I grew thousands of evergreen trees. Among the varieties of pine were:

native White Pine	—Pinus strobus
Norway pine	—Pinus silvestrus
Mugho pine	—Pinus pumila montana
sugar pine	—Pinus Lambertiana (not hardy in northern Wisconsin)
Swiss stone	—Pinus cembra (not hardy in northern Wisconsin)
Italian stone	—Pinus pinea (not hardy in northern Wisconsin)
pinon	—Pinus edulis (not hardy in northern Wisconsin)
bull pine	—Pinus Jeffreyi (hardy)
jack pine	—Pinus banksiana (very hardy)
limber pine	—Pinus flexilis (semi-hardy, a fine nut pine).

Many of the limber pines came into bearing about fifteen years after the seed was planted. At that age they varied in height from three to fifteen feet. One little three-foot tree had several large cones full of seed. Each tree varied in the quality and size of its seeds. Although it might be possible to graft the best varieties on young seedling stocks, in all the hundreds of grafts I have made on pine, I have been successful only once. I doubt that such a thing would ever be practical from a commercial standpoint unless some new method were discovered by which a larger percentage of successful grafts could be realized.

I cultivated the Douglas fir, white, Norway, and Colorado blue varieties of spruce. Besides these, I planted balsam fir, red cedar, Juniperus Virginiana, and white cedar, Arborvitae. Practically all of these trees are still growing and many of them bear seed.

I wish to describe the limber pine, Pinus flexilis, for it is not only a good grower and quite hardy but it is also a very ornamental nut pine which grows to be a broad, stout-trunked tree 40 to 75 feet high. The young bark is pale grey or silver; the old bark is very dark, in square plates. The wood itself is light, soft and close-grained, having a color that varies from yellow to red. The needles, which are found in clusters of five, are slender, 1–½ to 3 inches long, and are dark green. They are shed during the fifth or sixth year. The buds of the tree are found bunched at the branch tips and are scaly and pointed. The limber pine has flowers like those of the white pine, except that they are rose-colored. Although the fruit is described as annual, I have found that, in this locality, it takes about fifteen months from the time the blossoms appear for it to reach maturity. That is, the fruit requires two seasons for growth, maturing its seeds the second September. The cones of the limber pine, which vary from three to seven inches in length, are purple, having thick rounded scales and being abruptly peaked at the apex. The seeds are wingless or have only very narrow wings around them.

With the idea of getting practical results sooner, since nut trees mature slowly, I interplanted my nut trees with varieties of apple, plum and cherry. Doing so also served to economize on ground, since ultimately nut trees require a great deal of space for best growth. Walnut trees, for example, should be set 40 to 60 feet apart in each direction.

Pinus Flexilus nut seeds, Natural Size

I learned a variety of facts during these first years of trial and error. I discovered, for instance, that iron fence posts rust away in an acid soil; that one must use cedar or oak. Conversely, in alkaline soil, iron will last indefinitely, but that the nitrogenous bacteria will quickly rot wooden posts. I found that the secret of growing hickories successfully lies in giving them plenty of room, with no forest trees around to cut off their supply of sunlight and air. I learned that it is impractical to graft a large forest tree of butternut or hickory. Incidental to that, I learned that a branch of a butternut tree which looks large enough to support a man's weight near the trunk, will not do so when the branch is green and alive, but that a dead branch of similar size will. Contrariwise, even a small green limb of a bitternut-hickory will bear my weight, but an old limb, though several inches thick, becomes so brittle after it is dead for several years that it will break under slight pressure. Fortunately, falls from trees do not usually result in serious injuries but I did acquire quite a few bruises learning these distinctions.

There is always a natural mortality in planting trees, but in those first years, lacking badly-needed experience, I lost more than 75%. Nearly all of them started to grow but died during the first few winters. Those which survived were the start of a nursery filled with hardy trees which can endure the climate of the north. In looking back, I appreciate how fortunate I was in having sought and received advice from experienced nurserymen. Had I not done so, frequent failures would surely have discouraged me. As it was, the successes I did have were an incentive which made me persist and which left me with faith enough in an ultimate success to go on buying seeds and trees and to make greater and more varied experiments.