I have a few lithops, they are hardy but I have not managed to keep the all alive they need water from splashing rain drops but not directly applied water in my experience. I shelter them from direct rain and it seems heat and cold are not a concern. I have had one flower but I was away so I have never seen a flower in full bloom. I have seen a coue split in two, to form two separate individuals, something Wikipedia says they don't do. really good plants if you travel a lot.