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Polygonum Aviculare

Scientific testing has not definitely proved knotweed's effectiveness externally as an astringent or internally as a remedy for diarrhea, but pharmacologists state that these uses may be valid owing to the plants tannin content.

Cook knotweed before eating it; raw knotweed can cause intestinal disturbances. Do not confuse with smartweed, a relative with an acrid taste.

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