Hardy Geranium
Geranium 'Rozanne'
A popular herbaceous perennial featuring deeply lobed, marbled green leaves and a profusion of saucer-shaped, vibrant violet-blue flowers featuring distinct white centers and darker purple veining.
- Light
- Full sun to partial shade, approximately 6 hours or more of direct sunlight daily for optimal flower production.
- Water
- Requires moderate and consistent watering. Allow the top inch of soil to dry between waterings, but avoid prolonged drought which can reduce blooming.
- Growth
- Herbaceous perennial with a mounding and sprawling habit, reaching heights of 18 to 20 inches and a spread of up to 24 to 36 inches with a moderate growth rate.
Care instructions
Provide full sun to partial shade in moist, well-draining soil. Water regularly during dry spells to establish and maintain continuous blooming. Apply a balanced, slow-release fertilizer in early spring.
Growing details
Sunlight
Full sun to partial shade, approximately 6 hours or more of direct sunlight daily for optimal flower production.
Watering
Requires moderate and consistent watering. Allow the top inch of soil to dry between waterings, but avoid prolonged drought which can reduce blooming.
Soil
Prefers rich, humus-rich, well-draining loamy soils with a neutral to slightly acidic pH ranging from 6.0 to 7.0.
Hardiness zone
USDA hardiness zones 5 through 8, demonstrating strong cold resilience.
Growth habit
Herbaceous perennial with a mounding and sprawling habit, reaching heights of 18 to 20 inches and a spread of up to 24 to 36 inches with a moderate growth rate.
Bloom season
Blooms continuously from late spring through the first autumn frosts, producing saucer-shaped purple-blue flowers with prominent veining.
Propagation
Propagated primarily through stem cuttings taken in late spring or by root division in early spring or autumn.
Common pests & issues
Generally resilient, though occasionally prone to powdery mildew or fungal leaf spot in overly humid or poorly ventilated conditions. Prevent by ensuring adequate air circulation.
Similar species
Geranium himalayense, which features similar blue-purple flowers but typically has a shorter blooming window restricted mostly to early summer.