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Saguaro Cactus - How Deep Are the Saguaro's Roots?

From Judy Hedding, About.com

Saguaro CactusSaguaro Cactus © Judy Hedding
The root system of a saguaro is very shallow. There is a tap root that is only about 3 feet long, and the rest of the roots are only about a foot long. You may wonder how these roots support such great weight. The roots anchor the saguaro by wrapping themselves around rocks.
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