Plant in humus-enriched, moist, well-drained soil in full sun to partial shade. Space 24" apart. In spring, thin new shoots to 4-6 stems. Deadhead to keep the plant vigorous. Water deeply during periods of drought. Avoid wetting the foliage; plant is susceptible to powdery mildew. Divide plants every 2-3 years in early fall. Replant only small, strong outer divisions. Grows 36- 60" tall. Blooms June-September. Hardy in zones 3-8.