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On a recent trip to the Southwest we made an impromptu stop at Saguaro National Park just outside of Tucson, Arizona. There are many species of plants and animals to see in the park but of course the most impressive thing was the giant saguaros.
The saguaro is an arborescent (tree-like) cactus species which can grow to be over 70 ft tall. It is native to the Sonoran Desert in the U.S. state of Arizona, the Mexican state of Sonora, and the Whipple Mountains and Imperial County areas of California. The saguaro blossom is the State Wildflower of Arizona. Saguaros have a relatively long life span. They may grow their first side arm anywhere from 50 to 75 years of age, but some never grow one at all. A saguaro without arms is called a spear.
The arms are grown to increase the plant's reproductive capacity (more apices lead to more flowers and fruit). The growth rate of saguaros is strongly dependent on precipitation; saguaros in drier western Arizona grow only half as fast as thos...