Confederate Rose has been a solid zone 8 hardy for me ... mine (I grew it from seed) usually started blooming a few weeks before the first killing frost, November here so I was lucky to get 3 or 4 blooms out of it. In mid summer of 2014 I started feeding the bajeebers out of it every couple of weeks and it started blooming in mid October so I was able to get more blooms out of it.
It also got dug up and moved 6 times and didn't seem to bother it at all.