Check out this uniquely funky split rock Pleiospilos. At 2.5 inch, it’s small but mighty In its ability to make you smile! Pleiospilos Nelii, or also labeled as Split Rock, Living Rock Cactus, Cleft Stone, or Mimicry Plant, is an eye-catching flowering succulent native to South Africa. This plant doesn't grow more than a few inches in height and has two to four gray-green stone-looking leaves that are separated by a cleft down the center.