I'd be curious to know what the flowers look like, if it flowers. I'm not a sedum expert, I just know that when my sedum kamschaticum pop up in the spring, I get so giddy with excitement because they are the first bits of green each year here and they look adorable when they first come through as little spirals. Sedum is definitely fun to have (although ours wants to grow everywhere in our yard now...so it might be less fun in the future if it becomes invasive).
I hope you get a firm ID on your plant!
