Answer: As they age, saguaro will lose some color. (Take a look at saguaro growing in the desert naturally.) There's nothing you can do to change the color. Keep your saguaro healthy by insuring that it gets a deep soaking (water should penetrate about one foot deep well past the trunk area) about once a month in hot months. If summer monsoons are heavy, this won't be needed. Winter rains are usually adequate.
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