The visual identity of the American southwest has certain iconic signifiers: desert plains, tumbleweeds, rusty-red rock formations and a certain towering cactus called the Saguaro. These cacti, some as tall as 50 feet and as heavy as 8 tons, are one of the greatest symbols of Americas wild deserts.
The Saguaro Cactus is found only in the Sonora Desert, from sea-level to elevations of approximately 4,000 feet, and limited by freezing winter temperatures. Though their habitat is threatened by human encroachment, the Saguaro is a common cactus and is not endangered. They are a protected species in the confines of Arizonas Saguaro National Park.
Though it may eventually grow as tall as a 2 story house, the Saguaro is a very slow-developing cactus that only grows between 1 and 1 1/2 inches in the 1st 8 years of its life.
Its initial survival strategy involves finding protection under the bows of a nurse tree.
Species of trees used by the Saguaro in this manner include the Palo Verde, the Ironwood and the Mesquite. Often, as the Saguaro grows ever-larger, the nurse tree is killed as the cactus monopolizes all the nutrients and water in the soil. The...
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