Black Walnuts & Azaleas - Knowledgebase Question

Name: Carol Siemon
East Lansing, MI
Question by csiemon
March 30, 2000
I have several black walnut trees that have killed several rhododendrons & azaleas and are slowly killing my remaining rhods. and a mountain laurel. Is it possible to plant the azaleas etc. in pots and then bury the pots? If I keep the leaves and walnuts off the soil and keep them away from the drip lines of the black walnuts, do you think this would be enough to protect them from the toxins? thank you


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Answer from NGA
March 30, 2000

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Although the majority of the toxin is released in the root zone which can extend about half again as far as thebranch spread, there is also a certain amount present in the fallen leaves and stems and nuts, so unfortunately, I don't think your plan will work in the long run. This is especially true because the shrubs in question as a group have shallow but very wide-spreading roots and do not do all that well in containers without specialized soil mixes and watering techniques. Would it be possible to move them to another location instead? I'm really sorry I can't be more encouraging.

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