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Make sure your plants haveMake sure your plants have good drainage, and that they are set deep enough (6" or more). When the stalks brown and die around November, you can cut them back to just below ground level. Place plastic sheeting over the area, to protect the tubers from rot from winter rain. Next, add about 3 to 4 inches of mulch over the plants. In March, remove the mulch and plastic.

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