Grevillea is a genus of about 350 species of flowering plants . They are highly valued for their exotically shaped, vividly colored and nectar-rich flowers. Their flowerheads, which open at varying times, are composed of many small flowers that come in a wide range of colors. These unique evergreen plants come in all shapes and sizes and have an extremely long season of bloom. The species range from small shrubs around 50 cm (20 inches) high to large trees up to 35 metres (115 ft) tall.