The Astrantia Ruby Wedding, 'Astrantia', displays brilliant ruby red blooms. Height: 25-30". These long flowering perennials are ideal when planted in borders or along streams. Good naturalizer under light open trees. It makes an excellent cut flower. To stimulate more blooms, remove old flowers. These long flowering perennials are ideal when planted in borders or along streams. Astrantias thrive in moist, humus-rich or heavy clay soil. With good soil moisture, astrantias can be planted in full sun. To stimulate more blooms, remove old flowers. Blooms last long - late spring to early summer, and the bracts usually remain attractive well after bloom. Like little pincushions, their abundant blooms float above rosettes of mid-sized, deeply lobed, bright green leaves.