The Saguaro Cactus.A very prominent sight in the Sonoran Desert.I have often seen these on previous visits but didn't know that they don't grow a signature arm until they are around 75-90 years old....so these are very old plants.They can grow up to 25 arms(although some grow none) and live to the ripe old age of upwards of 200 years and can reach 60 ft. tall.