Family: Papilionaceae
Common Name: Rattle-box, Bird Flower

The common name given to this genus of plants derives from the Greek crotalum, a castanet or rattle, and refers to the rattling of the seeds when the inflated pods are shaken. Mostly from tropical regions, this large genus consists of annuals, perennials and shrubs from Africa and Madagascar, but extending to many other parts of the world. They have simple or pinnate leaves and pea-shaped flowers, generally in racemes, the flowers often resembling birds perched on twigs. 'their long flowering period and unusual blooms make them a very popular choice for the greenhouse or conservatory.

Species

Not all these species are available in the UK.

C. agatiflora, a popular species, is an open, evergreen shrub, 2-3 m (6-10 ft) high, with terminal sprays of greenish yellow flowers, tipped in brownish purple, in summer.

C. cunninghamii, parrot plant, an Australian native shrub, grows to 90 cm (36 in), with grayish, hairy leaves and bird-like green flowers.

C. laburnifolia, Queensland bird flower, grows to 3 m (10 ft). The yellowish green flowers, borne in terminal sprays, look like birds attached to the stems by their beaks.

C. spectabilis is an annual, growing to around 1 m (3 ft) high. It has thick branches, entire leaves and terminal sprays of profuse purplish flowers. This species is cultivated as a fodder plant in some countries.

Cultivation

In frost-prone climates, grow plants in pots in an airy, intermediate greenhouse or conservatory. Use soil-based potting compost, and provide maximum light but shade from direct sun. Prune back lightly after flowering to restrict size and maintain a good shape. Propagate from seed sown in spring, or from semi-ripe cuttings in summer, both with bottom heat.

Climate

At least zone 10.