Last year I wrote about the Cholla, or jumping cactus. Another kind of cactus is the Saguaro cactus, called the “old man of the desert”. The Saguaro cactus is the largest cactus found in the U.S. It can grow as high as a five-story building and live to be 150 to 200 years old. But they also grow very slowly. It can take 10 years for a saguaro cactus to reach 1 inch in height. They grow their first arm at the age of 70. Since they live in the desert where rain and water are scarce, they have one root that goes deep into the ground, and more roots are close to the surface to collect water. They can shrink and expand depending on how much water they are holding. After the saguaro dies its woody ribs can be used to build roofs, fences, and parts of furniture. Native Americans used these cacti as water containers long before the canteen was available. The Saguaro is only found in the Sonoran Desert in Arizona and Sonora Mexico. The flower of the cactus is the state flower of Arizona!