Overview
Hibiscus calyphyllus is a bushy shrubs in the genus Hibiscus, part of the Malvaceae family, with deciduous foliage. Hibiscus calyphyllus grows best in full sun, and tolerates loam soils and neutral pH. Its UK hardiness is rated H5. Suggested uses include shrub borders, specimen planting and hedging.
About
Hibiscus calyphyllus, commonly known as Rock's hibiscus, is a deciduous shrub within the Malvaceae family. It has a bushy habit and thrives best in fertile, well-drained loam soil with a neutral pH, requiring moist but well-drained conditions. This cultivar flourishes in full sun, ideally in a south-facing, sheltered position. It is hardy to UK zone H5 and is suitable for shrub borders, specimen planting, or hedging. The plant is notable for its extended flowering period during spring and summer, producing large, funnel-shaped blooms characteristic of the Hibiscus genus.
Growing conditions
Best soil and position for Hibiscus
- Sunlight
- Full sun
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
Hibiscus calyphyllus size, habit and characteristics
- Plant type
- Shrubs
- Habit
- Bushy
- Foliage
- Deciduous
- Suggested uses
- Shrub borders, specimen planting, hedging
Care notes
Pruning and caring for Hibiscus calyphyllus
- Propagation
- Semi-hardwood cuttings
- Pest resistance
- Aphids, scale insects, mealybugs, glasshouse whitefly
- Disease resistance
- Honey fungus, powdery mildews
Frequently asked questions
Where is the best place to plant Hibiscus calyphyllus?
Hibiscus calyphyllus prefers full sun. It suits sheltered positions.
What soil does Hibiscus calyphyllus need?
Hibiscus calyphyllus grows best in loam soil. It prefers neutral soil. Aim for soil that stays moist but well-drained.
Is Hibiscus calyphyllus hardy in the UK?
Hibiscus calyphyllus has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.
How do I propagate Hibiscus calyphyllus?
Semi-hardwood cuttings.
More in the Hibiscus genus
- Hibiscus 'Copenhagen'
- Hibiscus 'Mahogany Splendor'
- Hibiscus acetosella 'Haight Ashbury'
- Hibiscus acetosella 'Red Shield'
- Hibiscus arnottianus
- Hibiscus clayi
- Hibiscus coccineusAmerican scarlet rose mallow
- Hibiscus hamabo
