Black Walnut trees present a special challenge in the landscape because they secrete a substance that is toxic to many plants.

Landscaping Under Black Walnut Trees Why won't anything grow under these trees? Black walnut trees produce a chemical called juglone as a protective response to ensure the tree's survival.

Richard Martin has operated a walnut tree farm south of Gordonville for nearly 40 years. His methods are producing walnuts with higher kernel yield and larger trunks than average, and he will ...

Black walnut trees emit a compound that is harmful to some plants—but not these.