Castor Bean (Ricinus communis): Bold Foliage and Spiny Seed Pods

Castor bean (Ricinus communis) is a fast-growing, tropical shrub often grown as an annual for its huge, palmate, glossy leaves (up to 3 feet across) in shades of green, red, or purple, and its showy, spiny seed capsules. It adds dramatic architectural presence to summer gardens.

Warning

All parts of this plant are highly toxic, especially the seeds, which contain ricin, one of the most potent natural poisons. Do not grow where children or pets may access it. Remove flower spikes before seeds form if safety is a concern.

Culture

Full sun, rich, moist, well-drained soil. Grows 6–15 feet in a single season. Stake tall plants. Many ornamental cultivars offer colorful foliage (e.g., 'Carmencita', 'New Zealand Purple').

Taxonomy

• Family: Euphorbiaceae
• Genus: Ricinus
• Species: communis