The Saguaro, pronounced "sah-wah-roh", (Carnegiea gigantea) is a large, tree-sized cactus species in the monotypic genus Carnegiea. It is native to the Sonoran Desert in Arizona, the Mexican states of Sonora and Baja California, and an extremely small area of California. The saguaro blossom is the state flower of Arizona.
Saguaros have a relatively long life span. They take up to 75 years to develop a side arm. The arms themselves are grown to increase the plant's reproductive capacity (more apices equal more flowers and fruit). The growth rate of saguaros is strongly dependent on local precipitation patterns, and saguaros in drier western Arizona grow only half as fast as those in and around Tucson, Arizona. Some specimens may live for more than 150 years; the champion saguaro grows in Maricopa County, Arizona and is 13.8 meters (45.3 ft) tall with a girth of 3.1 meters (10 ft).