Overview
Costus speciosus is a clump forming conservatory greenhouse in the genus Costus, part of the Costaceae family, with evergreen foliage. Costus speciosus grows best in full sun, and tolerates loam soils and neutral pH. Its UK hardiness is rated H1a. Suggested uses include conservatory and greenhouse.
About
Costus speciosus (crepe ginger) is a clump-forming evergreen perennial from the genus Costus, known for its spirally arranged foliage and tubular flowers with three petals. It thrives in full sun on a south-facing, sheltered aspect, preferring moist but well-drained loam soil with a neutral pH. Suitable for conservatories and greenhouses in the UK due to its H1a hardiness, it is best planted in well-drained soil and requires watering during establishment. Interest is mainly in spring and summer, with propagation possible by seed or division in spring.
Growing conditions
Best soil and position for Costus
- Sunlight
- Full sun
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing
- Exposure
- Sheltered
- UK hardiness
- H1a
Plant details
Costus speciosus size, habit and characteristics
- Plant type
- Conservatory Greenhouse
- Habit
- Clump forming
- Foliage
- Evergreen
- Suggested uses
- Conservatory and greenhouse
Care notes
Pruning and caring for Costus speciosus
- Propagation
- Seed, division in spring
- Pest resistance
- Susceptible to glasshouse red spider mite under glass
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Costus speciosus?
Costus speciosus prefers full sun. It suits sheltered positions.
What soil does Costus speciosus need?
Costus speciosus grows best in loam soil. It prefers neutral soil. Aim for soil that stays moist but well-drained.
Is Costus speciosus hardy in the UK?
Costus speciosus has an RHS hardiness rating of H1a, meaning it needs tropical warmth above 15°C and must be grown under glass in the UK.
How do I propagate Costus speciosus?
Seed, division in spring.
