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Rozanne
Hardy geranium hybrid · Gomer and Rozanne Waterer, 2001, UK
At‑a‑glance
- Group/Class: Hardy geranium hybrid
- Height × spread: 12 to 18 in × 12 to 24 in (30 to 45 cm × 30 to 60 cm)
- Bloom window: Late spring to fall; main flush early summer
- Color & flower form: Violet‑blue, saucer‑shaped flowers with white eye and purple veins
- Fragrance: 0 none
- USDA hardiness: Zones 5 to 8
- Breeder / Year / Origin: Gomer and Rozanne Waterer, 2001, UK
- Awards/registration: RHS Plant of the Centenary 2013; RHS AGM; U.S. Plant Patent PP12,175; Missouri Botanical Garden Plant of Merit
- Pet safety: unknown
How it differs
- A true hardy Geranium, not a frost‑tender Pelargonium.
• Very long bloom relative to many hardy geraniums.
• Spreading clump rather than a stiff upright mound.
• Handles summer heat better than many hardy species when soil drains.
Strengths
- Extended bloom documented by botanic garden trials.
• Good heat tolerance for a hardy geranium.
• Supports pollinators.
• Low maintenance in well‑drained soil.
Care in one minute
Plant in full sun to part shade in well‑drained, moderately fertile soil.
• Water during dry spells; avoid waterlogged sites.
• Feed lightly in spring.
• Shear after first flush if growth flags in midsummer to prompt rebloom.
• Hardy in much of the region; no special winter cover needed in zones 5 to 8.
• Divide clumps to manage spread if required.
Watch‑outs
- Flowering may slow in peak summer heat; shear lightly to refresh.
• Needs space to spread.
• Some susceptibility to leaf spots and rusts if crowded or overwatered.
Best uses (tags)
Provenance note
A selected hybrid between Geranium wallichianum ‘Buxton’s Variety’ and G. himalayense from Somerset, England; protected by U.S. Plant Patent 12,175 in 2001.
References
- Missouri Botanical Garden – Geranium ‘Gerwat’ ROZANNE
- Royal Horticultural Society – Geranium Rozanne (‘Gerwat’) and award
- U.S. Plant Patent PP12,175 – ‘Rozanne’ (via USPTO/Google Patents text)
- Penn State Flower Trials – Geranium ‘Rozanne’ performance notes
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