I had this sedum in a pot for two years it died last winter.
I have had it in my sedum garden before and it died. I do not think it is a zone 6 hardy plant. When we have more of a zone 7 winter it survives.
I am a die hard thought I just picked it up at Lowes this week I am going to try it in the garden again and try it with more rocks and see if more drainage helps i t survive a zone 6 winter if we get a zone 6 winter this year or next.