Named by Mary and Peter Mitchell, UK, in1980 this is described as a very vigorous clone of Sempervivum calcareum, from the French Alps. The leaves have tips that are variably darkened, but this often disappears almost completely in summer (as in the photo below taken on 12 August).
Though they do not look much like the various forms of S. calcareum they have a similar solidity and general 'feel' of this species and provide a good, clear green to contrast with other rosette colours.
This example came from Rotherview Nursery, Westfield, East Sussex.
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