Question: what is the plural of Sempervivum? Anyway, the houseleeks all form tight rosettes of fleshy leaves, each rosette producing a number of offsets each year, so that a spreading, tight mat soon forms. After a few years a rosette may decide to flower, in which case it sends up a short stem, topped with a cluster of flowers, pink or yellow. It then dies, its place in the mat taken by youngsters. There are hundreds of named varieties, of which we offer some of the more distinctive ones, including some new varieties, bred by the late Matthew Ruane at Brynhyfryd Nursery. See also Jovibarba.
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Sempervivum arachnoideum

A wild form, with small, green and red leaved, cobwebbed rosettes.

Sempervivum arachnoideum subsp. tomentosum

Small, green and red leaved, highly cobwebbed rosettes.

Sempervivum 'Blood Tip'

Makes huge rosettes, olive green with dark red leaf tips.

Sempervivum 'Heigham Red'

Pointed leaves, green tipped and red in the centre, in compact rosettes.

Sempervivum 'Santis'

Webbed rosettes of deep red, fresh green at the centre, and pink flowers.