The saguaro (Carnegiea gigantea) is a large, tree-sized cactus species which can grow to be over 20 meter (70 ft) tall. It is native to the Sonoran Desert in the U.S. state of Arizona where it is the State Wildflower, the Whipple Mountains and Imperial County areas of California, and the Mexican state of Sonora.
Desert Rose (Adenium Obesum) is native to southern Africa and Arabia. When planted in the ground, Adenium can grow 4 to 6 feet tall with tons of spectacular flowers. The most striking feature of this plant is its caudex which can be shaped like a sculpture. Since it is not normally a deep root plant, shallow bonsai pots are great to cultivate and show off their extraordinary-looking caudex. This species of flowering plant could well be a good one for someone starting their bonsai experience.