Ricinus communis, commonly known as the Castor plant or Castor bean, is a striking ornamental species grown for its bold foliage and exotic appearance. This fast-growing perennial, often cultivated as an annual in temperate regions, can reach heights of 2 to 4 meters in a single season.

The large, palmate leaves—sometimes reaching over 50 cm in diameter—range from deep green to bronze or reddish-purple, depending on the cultivar. The plant produces clusters of small, inconspicuous flowers, followed by spiny, decorative seed pods containing the famous castor beans.

Though the seeds are highly toxic if ingested, Ricinus communis remains a favorite among gardeners and landscape designers for its dramatic silhouette and tropical flair. It thrives in full sun and well-drained soil, making it easy to grow in a variety of climates.

Ideal for borders, backdrops, or as a striking focal point in large containers. Not frost-tolerant—start seeds indoors in cooler zones.

How long does castor seed take to grow?

Castor seeds typically germinate within 10 to 21 days under warm conditions. With proper care, seedlings grow rapidly and may reach their full height by mid to late summer.

Is a castor plant a perennial or annual?

Ricinus communis is a perennial in tropical climates, where it can grow for several years. In temperate zones, it is usually grown as a fast-growing annual due to its sensitivity to frost.

Should I soak castor beans before planting?

Yes, soaking castor beans in warm water for 24 hours before sowing can help soften the seed coat and improve germination rates, especially in cooler conditions.