Sempervivum arachnoideum

Sempervivum arachnoideum, the cobweb house-leek,^[1] is a species of flowering plant in the family Crassulaceae, native to European mountains, in the Alps, Apennines and Carpathians. Growing to 8 cm (3 in) tall by 30 cm (12 in) wide, it is a rosette-forming succulent perennial, valued in cultivation for its ability to colonise hot, dry areas via offsets.^[2]

Sempervivum arachnoideum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Saxifragales
Family:	Crassulaceae
Genus:	Sempervivum
Species:	S. arachnoideum
Binomial name
Sempervivum arachnoideum L.

The specific epithet arachnoideum refers to its furry central rosettes (long ciliate leaf margins), resembling spider webs.^[3]

It flowers in July, with pink flowers that are raised on stems and are hermaphroditic (having both male and female organs).

This plant,^[4] and the subspecies Sempervivum arachnoideum subsp. tomentosum,^[5] have gained the Royal Horticultural Society's Award of Garden Merit.^[6]