I have black walnut trees in my garden. Are there plants that I should not plant under them?
Black walnut trees tend to create the ideal condition for themselves by releasing a chemical called juglone from their roots, leaves, and mulch.This released chemical prevents many plant species from thriving under and around the root zone of black walnuts .
Juglone does not move efficiently in the soil, therefore, plants may be affected if planted downhill from a black walnut tree or in a site where a black walnut may have been removed even if it has been a few years since it’s removal.
Many plants such as Tomato, potato, and peppers are sensitive to juglone, they cannot survive in the vicinity of this tree.Some plants will generally do fine if planted well outside the “drip zone”, or space directly under the tree.