Last week I got another email from a gardener who learned the hard way, that black walnut trees can be a mixed blessing. Black walnuts (Juglans nigra L.) are valuable landscape and lumber trees, but they 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.
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