I'm under the impression that all that is required to propagate a sempervivum from its pups is to remove the pup and stick it in the dirt, with water. It can't really be that simple, can it? I've got several large clumps I want to break up and distribute through a xeriscape, but I don't want to do something wrong and end up killing them all. In a related question, will sempervivum come reliably from seed? For example, if I were to plant mature flowerheads? Thanks for your help!