Thank you for the call out Marilyn.
Both Dudleya and sempervivum come from the family of Crassulaceae, so the two Genus are related. Dudleya is only hardy to zone 8, some say zone 9. But it is growing outdoors in my zone 8 garden. One in a container on the covered deck, the other out in the raised beds in sandy loam (very fast draining).
Hope this was helpful for both Marilyns.
