Alocasia macrorrhizos

RHS Plant Profile
giant taro

Other common names

cunjevoi, giant elephant's ear, taro

Synonyms

Alocasia indica (Lour.) Spach misapplied

Conservatory Greenhouse

A tropical rhizomatous perennial grown for its huge, glossy mid-green leaves. The leaf blades have pale green veins and can reach 1.2m long; they are carried on erect leaf stalks to 1.2m tall. It may produce a pale green flower in summer. Giant taro is widely naturalised and cultivated in tropical areas as a food crop, although it requires a long cooking time before it is safe to eat. In cool climates it makes an interesting conservatory plant

Position

Partial shade

Soil Types

Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
2–5 years
Max Spread
1.5-2.5 metres
Max Height
1.5-2.5 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
Sheltered
Hardiness
H1A

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Araceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Columnar upright
Potentially harmful
TOXIC if eatenskin/eye irritant. Wear gloves and other protective equipment when handling. TOXIC to pets - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus
Alocasia are robust evergreen rhizomatous or tuberous perennials with large, usually peltate, leaves with conspicuous veins; insignificant flowering spathes may be followed by orange-red fruits
Name Status
Correct
Plant Range
C Malesia to NE Australia

How to Grow

Cultivation

Grow indoors in a peat-free houseplant compost with added perlite, in bright, indirect light. Water freely and apply a general liquid fertiliser every 2-3 weeks from spring to autumn. Provide high humidity by placing the container on a tray of moist gravel or pebbles. Reduce watering to a minimum in winter, and keep above 15°C. See Alocasia for further advice

Propagation

Propagate by sowing seed at 23°C as soon as it's ripe, or by division of rhizomes in spring

Suggested planting locations and garden types

  • Architectural
  • City and courtyard gardens
  • Patio and container plants
  • Sub-tropical
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to mealybugs and glasshouse red spider mite

Diseases

Generally disease-free