Looking for plants that will grow under black walnut trees? Black walnut trees secrete a biochemical substance known as Juglone. These secretions sometimes drip from the leaves down onto plants and ground below and leaches out from the roots below ground as well.  

Though Juglone is a poison to many plant varieties, making it difficult in planting under black walnut trees.

A word of caution: Many factors, other than the presence of Juglone, will affect the viability of your trees and plants. Soil, moisture, temperature, shade and sunlight all play a role so results in growth may vary.

Our listing of plants for under black walnut trees has been taken from recommendations from Purdue and Ohio State Universities.