The castor plant grows in all sorts of inhospitable places. Although some cultivars of it are grown by gardeners for the colour and shape of the leaves, one must remember that it is a highly poisonous plant. 8 to 10 seeds of the castor plant can kill a man. The poison recin is in the husk.
Castor oil has been used as a medicine since 2ooo B.C. to cure arthritis .
In Brazil, it is used as a biodiesel. Castor oil is used as a lubricant for racing cars.