Sempervivum Calcareum Sir William Lawrence (Houseleek 'Calcareum Sir William Lawrence') - ... via @gardentags https://t.co/sw0CCaL2Bw

— za (@idybidyladybug) 2019.4.17

This is sempervivum calcareum. Also known as Sir William Lawrence sempervivum. Full sun/partial shade, fast grower. https://t.co/LrNFLb8nV8

— Tamaryn Shepherd (@ExMi) 2015.11.18