The largest succulent in the world is the Baobab Tree of Africa. The trunk, or main stem, of the plant can reach up to 92 feet in girth and reach heights of around 82 feet. It’s found in southern Africa in areas with hot, dry weather and well-draining soil. The smallest cacti in the world is Blossfeldia liliputana, which measures about a half-inch in diameter at maturity. It is native to South America, specifically Bolivia and Argentina.