this plant just keeps multiplying oh its own as well ok

Its one of the Sempervivums, commonly called house leek, most likely its Sempervivum tectorum

Yes definitely a sempervivum can also grow in the garden

It's a good doer in the garden and seems to go on for ever. It looks great in a shallow pan, in the rockery, or anywhere else and is easily propagated by breaking off the little florets and potting them up. Or even just sticking them somewhere else in the garden.