A seedling. I don't know the exactly parentage because I found this seedling between the stones of the driveway of my garage .
Maybe a mixture with S. tectorum arvernense and 'Pacific Sexy' ?
Leaves are red and brilliants in spring but green in others seasons. Rosettes are little (2 cm) and the plant is very prolific.
You can see the first original rosette here in spring 2014