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'''Yes''', the American sycamore tree (''Platanus occidentalis'') may be described as poisonous ... to certain plants. Specifically, the tree exerts an allelopathic effect on surrounding vegetation. That effect actually is a germination inhibitor, which keeps plants from maturing into attractive, healthy plants. It's the same effect that black walnut trees (''Juglans nigra'') exert on surrounding vegetation, to control competition.

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14y ago

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