9. Plant Overwintered Dahlias in Spring After the last frost in the spring, the tubers can be transplanted back outdoors for the growing season. Can You Overwinter Dahlias in Pots? Dahlias can be overwintered in pots. After the first frost, cut the stems back to 1-2 inches long. Move...
Ralph leaves them all in their pots for winter storage, which means “there’s no washing and no dividing in the traditional sense.” In spring, he empties the pots, “if only to see how they survived the winter. Maybe 15% shrivel up. Most of the others call for an executive decision...