Posted: 18/09/2016 at 17:09
In my (limited) experience of these, they're unkillable!
A few years ago I took over a neglected greenhouse where there were many houseleeks, large and small, in pots of dried-up compost. They all looked like ex-houseleeks. Nevertheless (always the optimist) I watered them and, by the time I came back the following week they'd all (well, mostly) perked up and looked green and reasonably healthy. I potted up some in fresh compost, and some went in the ground outside. All did well, most of them flowered and most also had offshoots,
So I don't think it matters much what you do with them!