Knotweed

seeds are edible.
seeds can be eaten whole or pounded into meal.
plants can be cooked and eaten.
varieties in Prince Edward Island are Common knotgrass (Polygonum aviculare) and Common knotweed (Polygonum arenastrum).
grows as a weed in a wide range, including dry areas, plains, and subapline regions.
raw plants eaten in quantity may cause stomach upset and/or diarrhea.

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