| Bernd, I have not bought semps from any nursery in the US but Squaw Mountains in Oregon is one of the sites I have in my favorites as they have quite the selection of sempervivums. There is a picture of the semp as well as a description of the coloring and its size. Large semps they classify as getting to 2.5" in diameter or more. http://www.squawmountaingardens.com/tabs2.cfm?CID=4&tab=%27a Jack from Cavendish Perennials in Ontario would be also living in a zone 5ish just like you are. So, any semps he can grow you should be able to also. If you go to his web site... http://www3.sympatico.ca/semps/index.html in his catalogue you can get a description of the semp and its size also. Then go to the Squaw Mountain site for pictures or to this Yahoo group site... http://mitglied.lycos.de/nabu/Index_of_all_CultivarsC.html I have now purchased about 150 different kinds from Cavendish Perennials in the past years with another 50 varieties coming again this spring. All the semps I have gotten from Jack have been fully winterhardy here in my Canadian zone 2b yard. Let us know which ones you choose and where you ordered them from. Brenda |