A Barrel Cactus is a type of cactus characterize by being approximately barrel-shaped. Barrel cacti are classified into the two genera Echinocactus and Ferocactus. Their pineapple-shaped fruit can be easily removed and tastes similar to lemons. It may reach over a meter in height. Its ribs are numerous and pronounced and the spines are long and yellow. Small yellow flowers appear around the crown of the plant only after many years. It is considered easy to grow and relatively fast growing. They may also produce round offshoots from the main stem, called pups.