Dahlias, whether planted in containers or the ground, can brighten any space, but they need protection from below-freezing temperatures if they are to bloom next spring, according to Nigel Colborn. Gardeners who live in frosty climates should dig the plant's oblong tubers and place them in a dry environment, while those who experience warmer temperatures can leave the plant in the ground, but the soil surrounding the plant should be covered with a thick layer of mulch, he adds.

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