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.

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

Many hostas thrive in shade, which makes them an appropriate choice to grow near or under trees. Henkin says hostas are fine for growing near a black walnut tree and can withstand exposure to juglone.