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

by Carl Weschcke

October 5 and 6: Picked all of hazilbert No. 2 except the last two nuts.

Gellatly filberts were picked about October 10 and were ripe at that time.

October 11 to 13: Two English walnuts were picked and found to be as ripe as they would get. These as well as the black walnuts showed distinct signs of lacking summer heat needed for their proper development. The last two nuts on hazilbert No. 2 and the only nut on hazilbert No. 4 were picked at this time and were ripe. Chestnut burrs had opened up and the nuts enclosed were fully mature.

October 19 and 20: I found the last of the Winkler hazelnuts had been picked during the previous week, approximately October 14. These were left the longest on the bush of any hazel and still were not ripe although they were not entirely killed by the several frosts occurring before that time. They are always much later than the wild hazel."

On October 20, I had an opportunity of comparing the action of frost on the leaves of these plants. Those of the White Aveline type had not changed color and were very green. The leaves of the Jones hybrid showed some coloration but nothing to compare with those of the Winkler hazel, many of which had the most beautiful colors of any of the trees on the farm—red, orange and yellow bronze. Hazilbert No. 1, which resembles a wild hazel in appearance and habits of growth, had colored much earlier in reaction to the frost and was as brightly tinted as the wild hazel and Winkler plants except that, like the wild hazel, it had already lost much of its foliage. Some of the wild hazels were entirely devoid of leaves at this time. Hazilbert No. 5 showed the best color effects with No. 4 second and No. 2 last.

The color of the leaves and the action of the frost on the plants during the autumn is another thing, in my opinion, that helps to differentiate between and to classify European filberts, American hazels and their hybrids. My conclusion in regard to the effect of frost is that the reaction of the Winkler hazel is very similar to that of the wild hazel in color but exceeding it in beauty since its leaves do not drop as soon after coloring. At this time, the leaves had not changed color on the imported European plants, the Gellatly filberts from British Columbia or the White Aveline type. They had turned only slightly on the Jones hybrid. I think an accurate idea of the general hardiness of a plant is indicated by the effect of frost and by early dropping of leaves, using the sturdy wild hazel as the limit of hardiness and assuming that its hardiness is shown by both degree of coloration and early dropping of leaves.

In noting the action of frost on the Winkler hazel, I have mentioned that it was more like that on the American hazel than on the European filberts. The Winkler has always been considered a native woodland hazel, but, although it does show several similarities to Corylus Americana, I have also noticed certain qualities which definitely suggest some filbert heritage. I have based my theory on a study of the Winkler hazels which have been bearing annually at my farm for six years, bearing more regularly, in fact, than even the wild hazels growing nearby. My comparisons have been made with wild hazels in both Minnesota and Wisconsin and with European filberts.

I found the first point of similarity with the filbert is in the involucre covering the nut. In the wild hazel, this folds against itself to one side of the nut, while in the filbert it is about balanced and if not already exposing a large part of the end of the nut, is easily opened. The involucre of the Winkler hazel is formed much more like that of the filbert than that of the hazel. In Corylus Americana this involucre is usually thick, tough and watery, while in the filbert it is thinner and drier, so that while a person may be deceived in the size of a hazelnut still in its husk, he can easily tell that of a filbert. This is also true of the Winkler whose involucre is fairly thick but outlines the form of the enclosed nut. Another feature about the involucre of the Winkler which classes it with the filberts rather than the hazels is in its appearance and texture, which is smooth and velvety while that of the hazel is hairy and wrinkled.

The staminate blooms of the Winkler hazel show similarity to those of both filberts and hazels. Sometimes they appear in formation at the ends of branches, much as those of the European filberts do, in overlapping groups of three or four. Again, they may be found at regular intervals at the axis of leaf stems very much as in the case of the American hazel. The buds on the Winkler hazel are dull red which is also true of those on the hybrid hazilberts, another indication of hybridity.

The initial growth of the embryo nut is very slow in the Winkler as it is in the filbert, as contrasted with the very rapid development of the native hazel embryo which matures in this latitude about one month ahead of the Winklers and some filberts. Although Winkler nuts are shaped like hazels and have the typically thick shells of hazelnuts, their size is more that of a filbert usually three times as large as a native hazel.