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Lupin, is the common name for members of the genus Lupinus in the legume family. The species are mostly herbaceous perennial plants 0.3-1.5 m (1-5 ft) tall, but some are annual plants and a few are shrubs up to 3 m (10 ft) tall. They have a characteristic and easily recognised leaf shape, with soft green to grey-green leaves which in many species bear silvery hairs, often densely so. The leaf blades are usually divided into 5–28 leaflets. The flowers are produced in dense or open whorls on an erect spike. The fruit is a pod containing several seeds. Like most members of their family, lupins can fix nitrogen from the atmosphere into ammonia, fertilising the soil for other plants.