Pleiospilos nelii (plee-oh-SPIL-os) is a flowering succulent plant hailing from South Africa.It is a member of the Aizoaceae family and often confused with Lithops (living stones).
 
The living rock succulent produces new leaf-pair annually and absorbs its old leaves. love lots of light and warm temperatures. Some successful growers water only twice a year or depend on water from rainfall. Water once in the early spring and again in the early fall. Water the plant allowing the potting mix to become moist and until it runs through the drainage holes in the bottom of the pot just like any other cacti. Do not water again until the potting soil becomes completely dry and the plant begins to wither a bit.