Saguaro Cactus are slow growing but have a life of 150-200 years. It may grow only an inch or two in the first ten years of its life and does best when it has the protection of a "nurse" tree to shade it some in the first part of its life. It is common to see one growing with a Palo Verde tree protecting it and in later years of its life surrounded by the dead tree. On a trip to Joshua Tree Park we found this Palo Verde tree surrounded by six Saguaro Cactus. They are all over ten feet tall and one of them has an arm that normally means it is over a hundred years old. Certainly beyond the call of duty for this hardy Palo Verde tree.
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