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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Can a black walnut stump poison a garden?

>A person in our gardening club is planning on planting a vegetable garden >on the sight where a black walnut stump is buried. Is there any danger >eating the produce if it is grown there?


No, I don't think so, but plant growth may be a little slow there the first year or so after the tree was cut down.