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“Black walnut trees are notorious—sometimes you can see a line of dead plants through a garden that has a black walnut root underneath it,” says Myers. The black walnut has a chemical called juglone in its nuts, hulls, and roots, but also in smaller quantities in the leaves and stems, so plants underneath the tree’s canopy do especially poorly. A short list of juglone-sensitive plants includes blackberries, azaleas, hydrangeas, lilies, and petunias.
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