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Conservatory Greenhouse

Colocasia esculenta 'Black Coral' (Royal Hawaiian Series)

A frost tender, tuberous perennial to 1.2m tall, producing large, dark purple, almost black leaves, held on upright stalks. A striking summer foliage plant

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Size
Ultimate height
1–1.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Black Purple
Summer Black Purple
Autumn Black Purple
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Hardiness
H1B
Botanical details
Family
Araceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming, Columnar upright
Potentially harmful
Humans/Pets: Harmful if eaten, skin/eye irritant. Wear gloves and other protective equipment when handling For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus

Colocasia can be deciduous or evergreen, tuberous-rooted perennials with arrow-shaped or rounded leaves, often prominently veined; flowers are minute, on a spadix held within a small white spathe, but are seldom produced in cultivation

Name status

Accepted

How to grow

Cultivation

Plant tubers in a large pot of humus-rich compost in warm conditions in early spring. In early summer the pot can be positioned in a sunny or lightly shaded spot outdoors, with shelter from strong winds. Water freely when the plant comes into growth and apply a high nitrogen feed weekly. Either move the pot into a greenhouse or conservatory over winter, or lift the tuber and store it dry

Propagation

Propagate by division of rhizomes

Suggested planting locations and garden types
  • Patio and container plants
  • Sub-tropical
  • Bedding
  • Conservatory and greenhouse
Pruning

No pruning required

Pests

May be susceptible to glasshouse red spider mite, aphids and glasshouse whitefly

Diseases

Generally disease-free

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