Sempervivum calcareum

Sempervivium calcareum, the houseleek, is a species of flowering plant in the stonecrop family Crassulaceae, native to the southern Alps in Europe. An evergreen succulent perennial, it has a rosette with thick leaves that store water. The leaves are usually green with reddish-purple tips. This plant reproduces with asexual budding and monocarpic sexual reproduction.^[2]

Sempervivum calcareum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Saxifragales
Family:	Crassulaceae
Genus:	Sempervivum
Species:	S. calcareum
Binomial name
Sempervivum calcareum Jord.
Synonyms[1]
List Sempervivum californicum K.Koch Sempervivum columnare Jord. & Fourr. Sempervivum greenii Baker Sempervivum racemosum Jord. & Fourr. Sempervivum tectorum var. calcareum (Jord.) St.-Lag. Sempervivum tectorum subsp. calcareum (Jord.) Rouy & E.G.Camus Sempervivum tectorum var. columnare (Jord. & Fourr.) Rouy & E.G.Camus Sempervivum tectorum var. racemosum (Jord. & Fourr.) Rouy & E.G.Camus

Sempervivum calcareum is cultivated as an ornamental garden plant. It is suitable for a well-drained spot in full sun, such as a rockery. The cultivars 'Extra',^[3] 'Guillaumes'^[4] and 'Sir William Lawrence'^[5] have gained the Royal Horticultural Society's Award of Garden Merit.^[6]