Gardening Question of the Week: How Do Black Walnuts Affect Other Plants?
Thursday July 3, 2008
Judy emailed me to ask: “I recently talked to someone about tomato plants. What or how does a walnut tree effect them?” Black walnuts (Juglans nigra L.) are valuable landscape and lumber trees, but black walnut trees are not always good companions for other plants. They produce a chemical called "juglone", which can be allelopathic to many common plants, including tomatoes. Here’s some advice for what to avoid and how to garden around black walnut trees.
Photo: Courtesy of constantin jurcut / Stock.xchng. Used with Permission.
Comments
Black walnut trees cannot EFFECT other plants. Perhaps, though, they can AFFECT other plants.
Thank you for pointing that out. But what is the effect of their affect on other plants? That’s the question.