cover dahlia tubers and store in a cool dry place to plant later
Photo: Friedrich Strauss/GAP Photos
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How to Dig Up and Overwinter Dahlias: Step 3

Cover the tubers with slightly dampened peat moss, sand, sawdust, or wood shavings. Store in a cool, dry place, such as a shed, an unheated basement, or a garage. Too-warm tubers shrivel; if too cold, they freeze or rot. Check them monthly and relocate if necessary.
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