Full sun; a large, evergreen shrub with fragrant leaves. Blooms on new growth, with bright red, fine-textured puff flowers that bloom during warm weather.Various species are available in the landscape trade. Callistemon citrinus is commonly used as a foundation plant or a bush; Callistemon linearis is the taller treelike species. Both are slow growing but very drought tolerant; they can be damaged by extremely cold, however.