This is Callistemon citrinus, also kmown as Lemon Bottlebrush and Crimson Bottlebrush. This eye catching shrub can get to a maximum height of about 8 feet and should be planted in the full sun. It blooms from the middle of the Spring until the middle of Summer and has the most wonderful fragrance. The birds, bees, and butterflies agree with me because they are having a ball all over it. Hummingbirds pay close attention to this bush. USDA Hardiness Zones 8 to 10.