It is my understanding that juglone is in all parts of the tree, so as
the leaves and fruits fall and decompose, you release limited amounts of
it into the soil, with the heaviest concentration logically under the
tree. I'd bet that only downwind/downslope plants are affected, where
the leaves fall.. probably in very windy locations, there is minimal
effect, only from roots, and that might be why some folks don't seem to
have as many issues as others. I have black walnuts in my pasture and
grass grows under them the same as the neighboring poplars. There is a
persimmon which always fruits heavy within 20 feet of the walnut..what
plants again did you say were affected?
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