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Plant in full sun for best flowering and form. Can become weedy and sparce if not grown in full sun. Well-drained soil is a must and if grown in zone 5 and there is a cold winter the top of the plant may die back from cold and can be pruned to 6 inches in spring when it will reflush from the base. Many times a hard prune in spring will encourage vigor and create a well formed shrub with beautiful flowers.