Hardy geranium Geranium 'Rozanne' Photo/Illustration: Michelle Gervais 1 2 3 4 5 6 7 8 9 10 11 Hardy geranium (Geranium 'Rozanne') jer-AY-nee-um Genus: Geranium The large blooms of this perennial are a spectacular violet-blue with a white throat and darker venation on plants 1 to 2 feet tall and wide. The attractive foliage weaves itself through neighboring plants. Grow in borders, containers, or rock or cottage gardens. 'Rozanne' is most effective en masse. Noteworthy Characteristics: A full season of blue-violet blossoms that seem to glow. Care: Site in full sun or partial shade. Tolerant of most well-drained soils, but prefers moderate fertility and a moist soil. Propagation: Divide in spring or fall. Problems: Hardy geraniums are prone to mildews, bacterial blight, gray mold, and leaf spots. Also watch out for leaf miner and slugs. Overview Height 1 ft. to 3 ft. Spread 1 ft. to 3 ft. Growth Habit Clumps, Spreads Growth Pace Moderate Grower Light Full Sun to Part Shade Moisture Medium Moisture Maintenance Low Characteristics Attracts Butterflies, Showy Flowers Bloom Time Early Summer, Late Spring, Spring, Summer Flower Color Purple Uses Beds and Borders, Ground Covers Style Cottage Garden Seasonal Interest Summer Interest Type Perennials Geranium 'Rozanne'View the discussion thread.