S. Sylvestris is a hybrid with half-inch-long pinkish flowers that form a thick clump atop rigid stems with scalloped leaves. 'Mainacht,' also called 'May Night,' has dense shoots of deep purple flowers that tower high above foliage from May to June and work well with pink-flowering plants.
Grows 18 to 24 inches tall and 12 to 18 inches wide in USDA Hardiness Zones 5 to 9; full sun.
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