Yes, the roots are undoubtedly edible as you pull them up. To someone. But I don't know many people who can keep them down without some hardcore work to turn them into flour. They are the only thing that has ever tasted better going up than going down, IME.
Roots, never. But the inner tubers are delicious! My DD (who is very picky eater) called it "sweet lettuce". Cattails are awesome. How many other plants can give you tinder, flour, shelter, food, stuffing for a pillow, etc. all at once???
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