Herbaceous Perennial: By day the flowers remain tightly curled, but by night the red buds uncurl into fragrant star white shaped flowers with an orange eye. Good border, container, alpine, and rock garden plant. Great night pollinator. Bloom time: late spring-summer. Height: 3-4". Width: 8-15". Water: moist with well-draining soil. Exposure: sun. USDA Z8.