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Barrel Cacti are always found in either a cylindrical or “barrel” shape. They are covered in large, usually thick spiky quills that are 2 to 3 inches long. These spikes not only help the plant gather moisture from the air but also protect the plant from possible predators. The Barrel Cactus needs to be completely in the sun for a majority of the time in order to survive. Colorful flowers grow from the top of the Barrel Cactus. These flowers do not have any spines or thorns. It is possible for Barrel Cacti to have fruit, but they are not edible to humans. The pulp of the Barrel Cactus is used in making certain kinds of candy. In an absolute emergency, the Barrel Cactus can be eaten to provide food energy and water.