Kate,
The plant does look pretty much the same as Sedum album comparing it to the database photos. The foliage also looks much the same (to me, anyway) to the Petrosedum rupestre. The label says the plant originated with CactusCollection.com in Vista, CA and I tried to go there but the site didn't come up for me. I never really trust labels altogether. It's good to have them, but sometimes they can be incorrect even with the best of intentions. In this case, the bold letters say it's cold hardy and then gives the moniker of Mexican Sedum/Sedum mexicanum. But included in the description aside from having white flowers is info that says it is only hardy to 32F. That's not very cold hardy to me. That says if it is exposed to freezing temps it's going to be killed. I guess I'll wait and hope it blooms and that helps. Probably it will just get stuck as some kind of Sedum.
