Sempervivum × giuseppii

Sempervivum × giuseppii, the roof houseleek, is a naturally occurring hybrid species of flowering plant in the family Crassulaceae, native to northwest Spain. Its parents are Sempervivum arachnoideum and Sempervivum cantabricum. A succulent, cold-hardy to USDA zone 7, it has gained the Royal Horticultural Society's Award of Garden Merit.