‘Rozanne Geranium (Geranium ‘Rozanne’) is a well-behaved, non-native groundcover plant with purple blooms from mid-spring through fall. They prefer mesic soil in sun to part sun, though we’ve seen it grow well in full shade, too. Colonies form as the plants mature, making them a good choice for groundcovers on banks and slopes, growing to 2 feet tall. Companion plants include Nodding Onion (Allium cernuum) and Foamflower (Tiarella cordifolia).
In late winter, cut back dead foliage to 3 inches around the main plant. If needed during the growing season, trim away from garden edges near sidewalks.