I just added this one last summer. I bought it as a blooming clump, brought it home, planted and watered it in well. It never missed a beat and continued to bloom well after transplanting for quite a long time. It has a bit of green starting to show, so it seems to have made it through its first winter in my garden.
Edited August 4, 2018, to add:
Bluebird Butterfly came through the winter well. I didn't think it was going to bloom this season, but today I noticed a scape, so it will be blooming late.
