There are those plants that are so easy to reproduce that become viewed as "common" and therefore are ignored. This is one of those plants. Each new "thimble" can easily break loose and root, thus forming a fast growing mound of cacti. But just because it's easy to grow doesn't mean it should be ignored. Even the experienced cactus grower can enjoy the challenge of creating a showy mound of these plants, presenting it in an appropriate pot and making an impression on even the most jaded cactophile!