Sempervivum Emerald Giant..... Some say this is the largest green Sempervivum available today. I do not want to make that claim but I do know it can get huge and is bright green not the pale blue green shown in the photo.. It has a deep root and needs very sharp drainage in P.N.W. winters. It also needs some space to grow in a very large container or the rock garden. Hybridizer. C. W. Woods U.S.