If you live in a cold are and want to overwinter your tender perennials, simply dig up the roots or entire plant and bring it indoors to a nonfreezing spot to spend a few months as a dormant or semi-dormant houseplant. Pot the plants in any good soil and grow them in a cool (40–50°F) and bright area. Keep them barely moist. The idea here is to just keep them alive until you can plant them back outside after the danger of frost next spring. Then with warmer temperatures and brighter light, they’ll spring back to life. You can also trim and prune down your perennials and use mulch to protect them through the winter.
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