The Saguaro is unique in that it exists only in the Sonoran Desert. Its flowers are white and it blooms in the spring. It grows about an inch a year. The most mature saguaros are thought to be about 200 years old with more than 50 arms. The average saguaro has about 5 arms and is around thirty feet tall. The Saguaro Cactus is the State Flower of Arizona.

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