Don't plant white pine near Walnut!
It has long been known that black walnut (Juglans nigra L.) trees can adversely affect the growth of nearby plants of various species, and this problem has been studied extensively in West Virginia by Brooks. But, it is hard to quantitatively evaluate the phenomenon. The authors have tried to do so and their findings are described in this article.
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Author(s): Harry V. Wiant, Jr., Miguel A. Ramirez
Publication: Tree Planters' Notes - Volume 25, Number 4 (1974)
Volume: 25
Number: 4