Black Walnut Friendly Trees
Black walnut trees produce juglone, which is toxic to many plants. However there are several trees that can grow around black walnut trees. Here are a few with evidence photos.
Redbud
Sycamore
Sweetgum
Arborvitae
Oak
Sugar Maple
Tulip Tree
Catalpa
Honey Locust
Japanese Zelcova
Marcus Reynor