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Easily grown in average, moist, acidic, well-drained soils in full sun to part shade. Winter hardy to USDA Zones 7-9. May be attempted in protected locations in Zone 6. Plants usually die to the ground in the cold winter climates of Zones 5 and 6, but may send up new shoots from the roots the following spring. Special features: Specimen, group or mass. Border, foundation or hedge. Site in areas where the flowers and fragrance plus the visiting butterflies may be easily observed. Straight species is infrequently marketed in commerce.