'Australian Bottle Brush' I have included here some of the best forms of hardy and semi hardy varieties. Callistemon Rigidus and Callistemon Salignus Rubra have slightly smaller flowers than some of the more tender species, but well worth growing for an unusual shrub with masses of brilliant bright red flowers about 3” long in early summer. The seed is small, not difficult to grow, with a flowering plant in the second year if sown early. Callistemon Salignus Rubra is a more weeping and smaller variety. Captain Cook is a weeping large flowered form of Callistemon Viminalis but also reasonably hardy for milder areas.