Growing Nuts in the North / A Personal Story of the Author's Experience of 33 Years with Nut Culture in Minnesota and Wisconsin

Chapter 6 PECANS AND THEIR HYBRIDS

At the same time, October 1924, that I purchased Beaver hickory trees from J. F. Jones, I also procured from him three specimens each of three commercial varieties of pecan trees, the Posey, Indiana and Niblack, as well as some hiccan trees, i.e., hybrids having pecan and hickory parents. Only one tree survived, a Niblack pecan, which, after sixteen years, was only about eighteen inches in height. Its annual growth was very slight and it was killed back during the winter almost the full amount of the year's growth. In the 17th year this tree was dead.

In September 1925, at a convention of the Northern Nut Growers' Association in St. Louis, Missouri, I became acquainted with a man whose experience in the nut-growing industry was wide and who knew a great deal about the types of hickory and pecan trees in Iowa. He was S. W. Snyder of Center Point, Iowa. (He later became president of the Association.) In one of his letters to me the following summer, Mr. Snyder mentioned that there were wild pecan trees growing near Des Moines and Burlington. I decided I wanted to know more about them and at my request, he collected ten pounds of the nuts for me. I found they were the long type of pecan, small, but surprisingly thin-shelled and having a kernel of very high quality.

I first planted these nuts in an open garden in St. Paul, but after a year I moved them to my farm, where I set them out in nursery rows in an open field. The soil there was a poor grade of clay, not really suited to nut trees, but even so, most of the ones still remaining there have made reasonably good growth. I used a commercial fertilizing compound around about half of these seedlings which greatly increased their rate of growth, although they became less hardy than the unfertilized ones. After five years, I transplanted a number of them to better soil, in orchard formation. Although I have only about fifty of the original three hundred seedlings, having lost the others mainly during droughts, these remaining ones have done very well. Some of these trees have been bearing small crops of nuts during the years 1947 to date. The most mature nuts of these were planted and to date I have 17 second generation pure pecan trees to testify as to the ability of the northern pecan to become acclimated.

I gave several of the original seedlings to friends who planted them in their gardens, where rich soil has stimulated them to grow at twice the rate of those on my farm. There were four individual pecan trees growing in or near St. Paul from my first planting, the largest being about 25 feet high with a caliber of five inches a foot above ground. Although this tree did not bear nuts I have used it as a source of scionwood for several years. These graftings, made on bitternut hickory stock, have been so successful that I am continuing their propagation at my nursery, having named this variety the Hope pecan, for Joseph N. Hope, the man who owns the parent tree and who takes such an interest in it.

Shows the use of a zinc metal tag fastened by 16 or 18 gauge copper wire to branch of tree.

By the year 1950 the tree had such a straggly appearance, although still healthy and growing but being too shaded by large trees on the boulevard, that Mr. Hope caused it to be cut down. The variety is still growing at my farm, grafted on bitternut stocks and although blossoming it has never produced a nut up to this time.

Another tree given to Joseph Posch of the city of St. Paul, Minnesota, had made even better growth and was luxuriantly healthy and in bloom when it was cut down by the owner because the branches overhung the fence line into a neighbor's yard. This was done in about 1950.

Another tree given to Mrs. Wm. Eldridge of St. Paul still flourishes and is quite large (in 1952 at breast height, 6 inches in diameter) but being in a dense shade, it has not borne any nuts.

The fourth tree, given to John E. Straus, the famous skate maker, presumably exists at his lake residence north of St. Paul. I have not seen it in the last seven or eight years.

Although they are not as hardy as bitternut stocks, I have found the wild Iowa pecan seedlings satisfactory for grafting after five years' growth. I use them as an understock for grafting the Posey, Indiana and Major varieties of northern pecan and find them preferable to northern bitternut stocks with which the pecans are not compatible for long, as a rule, such a union resulting in a stunted tree which is easily winter-killed. Although the Posey continued to live for several years our severe winters finally put an end to all these fine pecans. The root system of the seedling understock continued to live, however.

I chanced to discover an interesting thing in the fall of 1941 which suggests something new in pecan propagation. There were two small pecans growing in the same rows as the large ones planted fifteen years previously. When I noticed them, I thought they were some of this same planting and that they had been injured or frozen back to such an extent that they were mere sprouts again, for this has happened. I decided to move them and asked one of the men on the farm to dig them up. When he had dug the first, I was surprised to find that this was a sprout from the main tap root of a large pecan tree which had been taken out and transplanted. The same was true of the second one, except that in this case we found three tap roots, the two outside ones both having shoots which were showing above the ground. Another remarkable circumstance about this was that these tap roots had been cut off twenty inches below the surface of the ground and the sprouts had to come all that distance to start new trees. All of this suggests the possibility of pecan propagation by root cuttings. These two pecans, at least, show a natural tendency to do this and I have marked them for further experimentation along such lines.

On the advice of the late Harry Weber of Cincinnati, Ohio, an eminent nut culturist, who, after visiting my nursery in 1938, became very anxious to try out some of the Indiana varieties of pecans in our northern climate, I wrote to J. Ford Wilkinson, a noted propagator of nut trees at Rockport, Indiana, suggesting that he make some experimental graftings at my farm. Both Mr. Wilkinson and Mr. Weber gathered scionwood from all the black walnut, pecan, hiccan and hickory trees at their disposal, for this trial. There was enough of it to keep three of us busy for a week grafting it on large trees. Our equipment was carried on a two-wheeled trailer attached to a Diesel-powered tractor, and we were saved the trouble of having to carry personally, scions, packing material, wax pots, knives, pruning shears, tying material, canvas and ladders into the woods. Mr. Wilkinson remarked, on starting out, that in the interests of experimental grafting, he had travelled on foot, on horseback, by mule team and in rowboats, but that this was his first experience with a tractor.

When he saw the type of grafting with which I had been getting good results, Mr. Wilkinson was astounded. He declared that using a side-slot graft in the South resulted in 100% failure, while I had more than 50% success with it. He was willing to discard his type of grafting for mine, which was adequate for the work we were doing, but I wanted to check his grafting performance and urged him to continue with his own (an adaptation of the bark-slot graft to the end of a cut-off stub). We both used paper sacks to shade our grafts. Although results proved that my methods averaged a slightly higher percentage of successful graftings in this latitude and for the type of work we were doing, his would nonetheless be superior in working over trees larger than four inches in diameter and having no lateral branches up to eight feet above ground, at which height it is most convenient to cut off a large hickory preparatory to working on it.

In the late fall of that year, we cut scionwood of the season's growth and inverted large burlap bags stuffed with leaves over the grafts, the bags braced on the inside by laths to prevent their collapsing on the grafts. So we have perpetuated the following varieties:

Hickories: Cedar Rapids, Taylor, Barnes, Fairbanks.

Hiccans: McAlester, Bixby, Des Moines, Rockville, Burlington, Green Bay.

The Major and Posey pure pecans being incompatible on bitternut hickory roots were grafted on pecan stocks, but they proved to be tender to our winters and the varieties were finally lost.

Largest planted pecan in World having a record. About 17 ft. circumference breast height, 125 ft. spread and 125 ft. height. Very small worthless pecans. Easton, Maryland. Photo by Reed 1927

Other experiments I have made with pecans include an attempt to grow Southern pecans from seed, but they seem to be no more hardy than an orange tree would be. It is certain that they are not at all suited to the climate of the 45th parallel. In 1938, I received from Dr. W. C. Deming of Connecticut, some very good nuts from a large pecan tree at Hartford, Connecticut. Of the twelve pecans I planted, only six sprouted, and of these, only one has survived up to this date and is now a small weak tree. Apparently, the seedlings of this Hartford pecan are not as hardy as those from Iowa.

Iowa seedling Pecans. Tree planted in 1926 as seed. First crop October 29, 1953. 7/8 of actual size. Nuts were fully matured. Photo by C. Weschcke

Of the hiccans, hybrids between hickory and pecan, there are several varieties, as I mentioned before. Of these, the McAlester is the most outstanding, its nuts measuring over three inches in circumference and about three inches long. Horticulturists believe that this hybrid is the result of a cross between a shell-bark hickory, which produces the largest nut of any hickory growing in the United States, and a large pecan. I have experimented a number of times with the McAlester and my conclusion is that it is not hardy enough to advocate its being grown in this climate. There are other hiccans hardier than it is, however, such as the Rockville, Burlington, Green Bay and Des Moines, and it is certain that the North is assured of hardy pecans and a few hardy hybrids, which, although they do not bear the choicest pecan nuts, make interesting and beautiful lawn trees. Indeed, as an ornamental tree, the pecan is superior to the native hickory in two definite ways: by its exceedingly long life, which may often reach over 150 years as contrasted with the average hickory span of 100 years, and by its greater size. One pecan tree I saw growing in Easton, Maryland, in 1927, for example, was then seventeen feet in circumference at breast-height, one hundred twenty-five feet in height and having a spread of one hundred fifty feet. The wood of the pecan is similar to that of the hickory in both toughness and specific gravity, although for practical purposes, such as being used for tool handles, the shagbark hickory is enough harder and tougher to make it the superior of the two.

I was pleasantly surprised on October 30, 1953 when a pecan seedling of the Iowa origin, which had not yet borne any nuts, showed a small crop. These nuts were fully matured and were of sufficient size so that they could be considered a valuable new variety of pecan nut for the North. A plate showing a few of these pecans illustrates, by means of a ruler, the actual size of these pecans, and the fact that they matured so well by October 30 indicates that in many seasons they may be relied upon to mature their crop. No other data has been acquired on this variety and we can only be thankful that we can expect it to do a little better in size as successive crops appear, which is the usual way of nut trees. Also, by fertilizing this tree we can expect bigger nuts, as is generally the case. The shell of this pecan is so thin that it can be easily cracked with the teeth, which I have done repeatedly, and although small is thinner-shelled than any standard pecan.

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