Standing sentinel in the desert, the towering saguaro is perhaps the most familiar emblem of the Southwest. Known for their height (often 50 feet) and arms reaching out in weird configurations, these slow-growing giants can take 15 years to grow a foot high and up to 75 years to grow their first arm. They are found only in the Sonoran Desert, and the largest concentration is in Saguaro National
Park. In late spring (usually May), the succulent's top is covered with tiny white blooms—the Arizona state flower.The cacti are protected by state and federal laws, so don't disturb them.