Description

Castor Bean (Ricinus communis) is a giant annual grown for its large star shaped leaves and highly ornamental summer flowers and spiky seed pods. Being one of the fastest growing plants, it will germinate from a seed and can reach 5 feet tall in one month. Ultimate height at the end of the season is usually 8 to 12 feet. Growth rate, however, is directly proportional to available water and soil quality. In poor dry soil areas, a height of 3 feet may be achieved with some flowering by fall. In the landscape, this amazing annual can be used for lots of coverage is needed quick. Maintenance is considered medium. Staking by mid-summer may be necessary to prevent plants from blowing over. All dead foliage should be removed right before or promptly after the first fall freeze. At that time, seeds can be clipped off and immediately planted if you would like castor beans to return next spring. Seeds may also be harvested and stored and will not survive winter outside unless planted or covered by a deep layer of mulch. If planting seed in the spring, wait till soil warms up in early May. Seeds germinate quickly and extremely easily with almost no effort. Castor Bean plants do not easily overwinter indoors as a house plant due to their need for tropical growing conditions and high humidity. Another word of caution is that castor bean seeds are extremely toxic. However there is almost never any poisonings because the seed tastes so bad if chewed that anyone in their right mind would spit it out. Seeds that are swallowed whole usually survive the digestive system and not cause poisoning. The plant itself is not very toxic so there is no reason not to grow it. If you are concerned about the beans, or you have small children, just cut off and dispose of the flowers after they bloom and before seeds ripen. You'll have plenty of time (1-2 months) before the bright red spiky seed pods open and turn brown. Purple Castor Bean (Ricinus communis 'New Zealand Purple') features bright purple foliage and dark red seed pods.