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 tops but Split Rock sits on top. Plus Split Rock will have multiple flowers.
The main problem with this plant is it demands so little attention. I've read where in a European environment a mature plant can go an entire year without being watered. I water mine lightly and infrequently and so far it is doing quite well. I'm hoping for flowers before too long.