How do you store potatoes and carrots long term?

Online Answer
Store them in a cool pantry or closet at 55° to 60°. If no cool place is available, pack them in layers of sand in barrels or crates. The sand cushions and keeps the tubers cool, but not cold enough to freeze. Place the containers in a moderately warm basement or garage.
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Kept in the dark: Davison says your potatoes should be stored inside a paper bag in a cool, dark, dry place. And as mentioned above, away from onions and their sprout-encouraging gases.
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