I am a cold zone 5, and it has done ok for me. Purple maze Is more peachy here. I tried daylilies in pots one winter, it was a disaster, lost them all. Had them in my garage, then They got aphids and rust, so I put them outside to kill off the nasties, but they were well protected.
Spring was wet with fluctuating temps, and every single one rotted and died. I found out later that I should have tipped the pots on their side at that point, apparently the water and frozen dirt kept them too wet. Haven't tried it since.
