Although in its tropical homeland, the caster oil plant, Ricinus communis, reaches 8-12m in height, its growth can be restricted in a British garden setting, and it's usually grown in containers as an annual. While Ricinus communis does produce greenish-yellow flowers, it is grown mainly for its large, glossy, reddish purple foliage.
Seeds must be sown early in the year, and ideally soaked for a few hours in tepid water beforehand. At the end of the season, plants are either discarded or rehoused under glass to grow on as a small conservatory shrub. All parts of Ricinus communis are highly toxic, particularly the seeds, so it's a good idea to deadhead the fluffy blooms before seeds set.
Plant calendar
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Sow
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Flowers
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Ricinus and wildlife
Ricinus has no particular known value to wildlife in the UK.
Is Ricinus poisonous?
Ricinus causes an upset stomach and toxins are absorbed by the skin. Its foliage, roots, sap, seed capsules and seeds are toxic.
