Cordyline australis is probably the best palm for screening. Cordyline australis is a small tree, usually forming a single trunk. This starts to break out as soon as it starts to flower. It will eventually form a spreading, bushy head. During the summer is develops a large, dense mass of fragrant white flowers. This evergreen should be planted in full sun, in a sheltered position. It has an eventual height of 10-30m and a spread of 1-4m.