It seems like every time I write about one of my plants I say it is my favorite. I can't help it. I find these succulents fascinating! Split Rock is also know as Cleft Stone and Mimicry Plant. It's scientific name is Pleiospilos nelii and it is from South Africa. I have a friend in San Diego who grows this in his rock garden but obviously it wouldn't survive Ohio's harsh winters. My friend thought that it was a kind of lithops but it isn't. Lithops are odd plants that grow buried up their…