My Sempervivum (actually a good number of my little friends) show the behaviour in the attached picture.
I take samples of these plants from my outside garden where they thrive and I'd like them to grow beautiful inside, in pots, where I can better tend to them and maybe use them as decorations. However, even after a long time, they either won't grow in size, or they'll sprout tall. From my experience of this variety of semperviva (they are from the Mediterranean), this sprout is not a flower.
At first, the leaves will curl downwards, then the center rises until it is grown up to a certain size, then is stops growing at all and remains in this status for a long time.
I don't know what to do about it, nor what caused it in the first place. Any help is accepted.
In the future, I'd like to avoid this, and, if possible, revert them to a more "appropriate" shape.