Assertion: black walnut's leaf | /r/LocatedNear | the nut
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text: The leaves, roots, bark, and walnut husks (also known as modified bracts) that surround the nut and its shell all contain something called juglone toxin, which incites cellular death in plants (making walnuts exceptional at killing off competing plants around them), insects, and small organisms like fish if the plant matter is consumed.