Let's call the whole thing Hens and Chicks!
Sempervivum (translated Live Forever) is a remarkable little succulent plant. There are literally hundreds of cultivars due to it's ease of seeding and the way it cross pollinates with others of it's own specie.
It is often referred to as Hens and Chicks because of the way it usually has one center Hen surrounded by many smaller Chicks. But don't be mislead ~ this is one tough little mother! It can survive cold, hot, wind, dry... almost any miserable condition. The one thing it does not like is to be soggy.
My father always had them growing somewhere in his yard. In his last yard he actually had a large rock with hundreds of them growing on it - with no soil!
They are the ultimate PassAlong Plant. The chicks can be pulled from the hen and placed somewhere else where you want them to grow. Easy-Peasy! You would really have to try hard to kill them.
They are fantastic alpine plants and are often used in Hypertufa troughs.
If you don't currently have any Hens and Chicks in your garden you are truly missing out on one of the easiest plants out there!
Get your hands dirty!