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Don't you mean cool and dark, Calendula?
Charlottes will store perfectly well through the winter - I do it nearly every year. Treat them as any other potato for store; don`t dig them up until the skins have had time to set properly, then dig them, up, dry them off, and put them in hessian sacks in a cool dark and frost free place.
I have mine in a fabric bag at the back of the fridge.I read somewhere about an old man who used to put some in a biscuit tin in dry peat and bury the tin in the garden, the story goes he would dig them at Christmas and could even scrape them?XX Jeannine