Geranium Rozanne

Description

Geranium ‘Rozanne’ – cranesbill

Botanical name: Geranium ‘Rozanne’ (Gerwat)
Common names: Cranesbill
Family: Geraniaceae
Plant type: Herbaceous perennial
Habit: Vigorous, low, spreading, scrambling
Pot size: 2–3 litre pot
Eventual size: Approx. 45–60cm tall × 90cm–1.2m spread
Foliage: Deeply divided, lobed green leaves, sometimes marbled, colouring in autumn; deciduous
Flowers: A remarkable, near-continuous succession of large, violet-blue saucer-shaped flowers with a white eye and fine reddish veining, from early summer until the first frosts (June–October)
Scent: Not notably scented
Aspect / light: Full sun to partial shade
Soil: Most soils; moist but well-drained, fertile; any pH
Hardiness: RHS H7 (very hardy, below −20°C); USDA zones 4–8
Exposure: Sheltered or exposed; very tolerant
Native range: Garden form; hardy geraniums are native across Europe and Asia
Toxicity / pet & child safety: Generally considered non-toxic to people and pets

Geranium ‘Rozanne’ is the finest of all cranesbills, flowering non-stop in violet-blue with a white eye from early summer to the frosts. Sterile, vigorous and superb for borders, groundcover and pollinators.

GardenAdvice notes

Widely regarded as the finest hardy geranium ever raised — and voted the RHS Plant of the Centenary — ‘Rozanne’ flowers almost without pause from early summer right up to the first frosts, carrying large violet-blue saucer-shaped flowers with a clear white eye. Being sterile it sets no seed and simply keeps flowering. Vigorous and scrambling, it weaves through neighbours, covers ground and never becomes a nuisance.

Growing & planting

Plant in spring or autumn in most soils soil in full sun to partial shade — hardy geraniums are among the easiest and most adaptable of all perennials. Space about 45cm apart. Water while establishing.

Care & maintenance

Low-maintenance. It flowers over a very long season with little help; shear it over lightly if it becomes untidy in midsummer and it will quickly refresh and keep going into autumn. Cut down old growth in late winter. Lift and divide congested clumps every few years in spring.

Propagation

• Division: Lift and divide established clumps in spring, as growth begins.

Pests & diseases

Generally trouble-free and healthy — hardy geraniums are among the most reliable of all perennials. Slugs may graze new growth, and powdery mildew or rust can occur in dry spells. Otherwise easy.

Uses in the garden

Superb in mixed, cottage and wildlife borders, as weed-suppressing groundcover, scrambling among roses, shrubs and other perennials, and in large containers, where its unmatched flowering season brings months of colour.

Wildlife value

Hardy geraniums are excellent for pollinators: their open, saucer-shaped flowers are very attractive to bees, hoverflies and other beneficial insects, often over a long season.

Toxicity & safety

Hardy geraniums are generally regarded as non-toxic to people and pets. Note that they are quite different from pelargoniums (the tender bedding and pot ‘geraniums’), which are toxic to cats and dogs.

GardenAdvice tip

If you only grow one hardy geranium, make it ‘Rozanne’ — it flowers non-stop from early summer until the frosts, in a lovely violet-blue with a white eye, and being sterile it never sets seed and never stops. It scrambles happily through roses and shrubs, so use it to weave a border together. If it sprawls untidily in midsummer, a light shear refreshes it in days.

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