Black Walnut

Question

Can rhododendrons grow around black walnut trees?

Answer 1

Hello,
Thank you for sending us your gardening question.

Black walnut trees have chemical properties in leaves and roots that can suppress the growth of other plants. This is called "allelopathy". Some plants are more susceptible to the allelopathic effect from black walnut than others, rhododendrons (including azaleas) are known to be affected.

This article has a section on allelopathic trees and discusses black walnut:

https://www.gardeningknowhow.com/garden-how-to/info/allelopathic-plants.htm

Please let us know if you have any other gardening questions and happy gardening!

Thanks
Gardening Know How

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