growing under walnut trees
perennials I can grow under a walnut tree
Jefferson County Kentucky
Black Walnut trees (Juglans nigra) have a naturally occurring substance called juglone that can cause yellowing, distorted growth and even death in a variety of other plants. Tomatoes and plants in the Solanacea family are especially vulnerable. Gardens, flower beds and other trees should be planted well away from black walnut trees. Leaves, stems, roots, bark and seeds (nuts) and hulls all have juglone within their tissue. I would not use black walnut leaves, sawdust or chips on a flower or vegetable garden if I could avoid it. Even composting black walnut leaves, sawdust and chips will not completely break down the juglone and sensitive plants might be affected.
Purdue has an excellent link about black walnuts, juglone and know sensitive plants that you may want to take note of:
Feel free to contact our office if you have other questions.
Let me know if I can help you further!
Jefferson County Cooperative Extension Service
200 Juneau Drive
Louisville KY 40243