They are popular because they are succulents. They store water in their stems and roots and can live up to a year without rain. It is not easy to grow barrel cactus indoors. Your plant will turn spindly and lose its colors if it is not provided with enough lighting. These cacti come in both the traditional shapes of paddling paddles and mostly round shapes. The most popular cacti from Madagascar are small shrubs, with thick succulent leaves. These leaves can be found in different forms and shapes. These plants are the easiest to propagate from stem cuts.