Hibiscus syriacus 'Minultra'PBR
rose of Sharon [Ultramarine]
A vigorous upright shrub up to 3m high, with deciduous, three-lobed green leaves, and single deep violet-blue flowers, 8-10cm across, with dark red centres and veins and cream stamens, from midsummer to early autumn; honeybees and bumblebees may visit for pollen
Size
Ultimate height
2.5–4 metresTime to ultimate height
5–10 yearsUltimate spread
1.5–2.5 metresGrowing conditions
Moisture
Moist but well–drainedpH
NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green | |||
|---|---|---|---|---|
| Summer | Blue Cream Red Purple | Green | ||
| Autumn | Blue Cream Red Purple | Green | ||
| Winter |
Position
- Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered Hardiness
H5Botanical details
- Family
- Malvaceae
- Native to the UK
- No
- Foliage
- Deciduous
- Habit
- Bushy
- Genus
Hibiscus can be deciduous or evergreen shrubs, trees, annuals or perennials, with simple or palmately lobed leaves and large, funnel-shaped flowers over a long flowering season
- Name status
Trade
How to grow
Cultivation
Grow in neutral, humus-rich, moist but well-drained soil in full sun, in a warm position such as a south-facing or west-facing wall to encourage flowering, and protect roots in winter with an organic mulch
Propagation
Propagate by softwood cuttings in late spring, by semi-ripe cuttings in summer, or by layering in spring or autumn; propagation for resale is prohibited without a licence
Suggested planting locations and garden types
- City and courtyard gardens
- Cottage and informal garden
- Low Maintenance
- Flower borders and beds
- Wall side borders
Pruning
Pruning group 1 (little or no pruning of trees and shrubs)
Pests
May be susceptible to aphids, scale insects, mealybugs and glasshouse whitefly when grown under glass
Diseases
May be susceptible to honey fungus (rarely) and powdery mildews
Get involved
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.