Family: Bixaceae

This genus comprises around 12 species of tropical trees and shrubs, most of which are xerophytes, plants which have adapted to extremely dry conditions. Many have underground storage tubers which enable them to survive harsh conditions; these also become deciduous through their normal dry season. Many flower when they are leafless in the dry season. They are not often grown outside their native country.

Species

C. religiosum (Synonym: C. gossypium), silk cotton tree, is native to Burma and India, growing 7-10 m (23-33 ft) high. It is cultivated in those countries both as a source of a commercially used gum and for the silky hairs of the fruits which are used to stuff pillows. It is also grown in several tropical countries, especially outside temples in India, as an ornamental. The bright yellow flowers generally appear on the leafless tree in the dry season.

Cultivation

In climates which are prone to frosts, grow in a warm greenhouse or conservatory as a foliage plant. Use very well drained, soil-based potting compost and provide maximum light, very little humidity, and keep dryish in the winter. If grown outdoors, they need full sun and well-drained, moderately rich soil.

Climate

Zone 10 and above.