Great explanation Tee. I just didn't want anyone to find out the hard way by freezing their Tender Succulents.
Here is a photo of a semp in bloom as compared to the echeveria in bloom. See how the bloom stalks are coming up from the center of the Sempervivum? The rosette will eventually dwindle away to nothing as it puts all of it's energy to producing the blooms and latter the seeds. the Echeveria puts the bloom stalks out the sides from between it's leaves and will not die after blooming.
A fun thing to do is place some semps next to your tender succulents and really look at them and compare the differences up close. The texture, shape of the leaves (as in how thick they are) and see what else you see that is different from each other.
