Do black walnut trees have allelopathic effects on other plants?
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Gardeners have heard that black walnut trees (Juglans nigra) contain a toxic chemical called juglone that will kill any other plants growing nearby. This phenomenon is called allelopathy, and, in recent years, many other possible allelopathic chemicals have been identified. This publication will review the current research into black walnut allelopathy and discuss the practical significance of gardening in the presence of black walnut trees.