It really seems strange that while the hazel generally is at home in the northern latitudes, it should partly freeze when the thermometer reaches say about 12 to 18 degrees below zero, and, as I had never noticed that before, it then occurred to me that possibly another reason could be found, why so many of the catkins were frozen.
Through my investigation in the spring of 1918, I have come to the conclusion that the unusually wet season in our vicinity of western New York throughout 1917 caused the hazel plants to grow until the real cold weather was upon them, which gave the wood a very poor chance to ripen, particularly the terminal buds, where a great many of the catkins had formed, and caused not only them to freeze but also a certain part of the wood. Only the lower and more protected catkins came through the winter alright and caused what little pollenizing was done, hence the very light harvest in the fall of 1918.
Should the results of my investigation prove true, and the continuance of the wet weather prove the main cause of freezing so many catkins, then it seems to me there is nothing to be alarmed about, and the planting of the European hazel, at least in this vicinity, for commercial purposes could be conscientiously recommended, and should be done, the sooner the better. We do not expect our apple or pear orchards to bear an abundant crop every year, and we should not expect it of our hazel orchards. Something will occasionally happen to them as well as to other crops, otherwise we run no risk whatever.
My trees or bushes, several hundred in number, planted in 1912 and later, have stood all kinds of weather, extreme cold, very hot, continuous wet, and still are growing most beautifully at the present time. They gave a very satisfactory crop of nuts this last fall, 1919, in spite of severe freezing weather on April 25th and 26th when the mercury dropped to 12 to 15 degrees, and all hazel bushes in full bloom. At the present time the prospect for a good crop of nuts next season is certainly very bright.
Neither fungus, blight, or other diseases of any kind, or troublesome insects have so far been detected. In planting the hazel for commercial purposes, I should recommend 12 feet distance between the plants each way, as they require abundant sun and air. At the same time, there is an opportunity to use the land between the rows for several years to come, as low growing crops like potatoes, strawberries, beans, beets, carrots, etc., could be grown there to great advantage, and the cultivation of these crops would be amply sufficient for the hazel plants.