Castor Bean (Ricinus communis): Growing Guide for Bold Foliage (Toxic)

Castor Bean (Ricinus communis)

Castor Bean is a dramatic, fast-growing tropical shrub (5–15 ft) with huge, palmate, reddish leaves and showy flower spikes. Grown for bold foliage in gardens or large containers. Extremely toxic: seeds contain ricin (deadly). All parts poisonous. Skin contact irritates. Remove flowers to prevent seeding. Many seed suppliers no longer sell.

Quick Facts

• Common Names: Castor Bean, Castor Oil Plant, Mole Bean, African Wonder Tree
• Botanical Name: Ricinus communis
• Plant Height: 5–15 ft (1.5–4.5 m)
• Life Cycle: Annual (tropical perennial)
• Toxicity: Deadly poisonous (ricin)

Growing from Seed

• Direct sow: After last frost, soil warm.
• Water: Keep well-watered.

Care Requirements

Light

Full sun.

Soil

Rich, well-draining. Amend with compost.

Watering

Weekly in dry periods.

Fertilizer

Monthly general purpose.

Safety

Never let flowers go to seed. Deadhead or remove buds. Wear gloves. Keep away from children/pets.