This grower is sure of this plant identification.
rooted offsets in 7cm pots
Cobweb houseleek, Houseleek
Sempervivum arachnoideum (Cobweb houseleek). This species produces a web of white hairs that cover the green, triangular-leafed rosettes. The flowers are pink to crimson in loose terminal clusters throughout the summer.
You can plant in full sun in a gravelly very well-drained soil.
Rock gardens. Summer interest. Suitable for coastal conditions.