Prune them and put them in a somewhat sheltered area outdoors. You do not want the roots to freeze, thaw, and freeze (repeat). Or, dig a hole and submerge the pot to its soil depth. You could try to keep them in a garage or basement, with occasional light watering.
Prune them and put them in a somewhat sheltered area outdoors. You do not want the roots to freeze, thaw, and freeze (repeat). Or, dig a hole and submerge the pot to its soil depth. You could try to keep them in a garage or basement, with occasional light watering.