Bev, I keep forgetting to say, Portulacaria afra is one of the plants that looks frozen. Another piece of it closer to the wall looks maybe OK still, but the ones closest to the most exposed edge went brown/mushy.
Stush, not a fan of walls, but if strictly for weather, I say heck yeah! Having a real winter down here, I'm not far enough south... We keep looking at Belize.
How's the other Haws out there? Plants grow fastest when pics of them are put on forums often. Don't slack in your duties!