I don’t know any gardeners who casually grow dahlias. Their fireworks riot of color has an intoxicating effect. You may start with one dahlia, but before you know it you have torn out the roses, ...
Dahlias need to be dug up and stored indoors to survive winter in Zones 7 and colder. Allow foliage to die back, then dig and cure tubers dahlias before storage. Balancing moisture and air circulation ...
Dig up dahlias about two weeks after the first frost so the tubers can form eyes for next year’s growth. Clean, divide, dry, and store tubers in moist peat moss or vermiculite in a cool, dark spot.