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ShrubsAnnual Biennial

Ricinus communis

castor oil plant

An erect, branching shrub to 1.5m when grown as an annual, with very deeply 5- to 12-lobed, glossy, green, red or bronze leaves to 30cm long, held on red stems. Insignificant yellow flowers are produced in summer; these are followed by bright red, spherical, spiky seed capsules

Other common names
castor bean
hands of Christ
see moreJonah's gourd
man's motherwort
mole bean
mole plant
oil plant
palma-Christi
palms of Christ
steadfast
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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
1 year
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Bronze Red
Summer Yellow Green Bronze Red
Autumn Green Bronze Red
Winter
Position
  • Full sun
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Hardiness
H2
Botanical details
Family
Euphorbiaceae
Native to GB / Ireland
No
Foliage
Evergreen
Habit
Columnar upright
Potentially harmful
TOXIC if eaten, wear gloves and other protective equipment when handling TOXIC to pets if eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus

Ricinus is a fast-growing evergreen shrub, often grown as an annual, with large, palmately lobed leaves and dense spikes of small flowers, followed by prickly seed capsules

Name status

Correct

Plant range
N.E. Africa to W. Asia

How to grow

Cultivation

Plant out after the last frosts in fertile, humus-rich, well-drained soil in full sun. Stake in exposed sites

Propagation

Propagate by sowing seed in spring, singly into 9cm pots

Suggested planting locations and garden types
  • Mediterranean climate plants
  • Patio and container plants
  • Sub-tropical
  • Bedding
  • Conservatory and greenhouse
  • Flower borders and beds
Pruning

No pruning required

Pests

May be susceptible to glasshouse red spider mite

Diseases

May be susceptible to honey fungus (rarely)

Get involved

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