I've had great luck with individuals of Cordyline fruticosa, Syngonium podophyllum, Kalanchoe blossfeldiana, Tradescantia pallida, Hypoestes, Caladium, cane Begonias, Billbergias, and Brugmansia surviving over winter, some for over a decade, and though not evergreen, growing back from the roots.
But this past winter, almost all C. fruticosa (1 alive, there were probably 7-8), all Caladiums (7 or 8), and all 5 Brugs seem to have given up. I haven't totally written-off the Caladiums yet but just a glimmer of hope remains at this late date.
For comparison, Billbergias look less affected than they usually do and put on a great show like usual. Monstera adansonii roots are still alive and growing new leaves. The Brugs are especially perplexing. They are a very common sight in this area.
I think the lowest low was about 22°, not as low as some previous winters through which now-deceased plants had previously survived. I don't remember noticing anything unusual about this past winter at all. The rest of my little list are all up and looking great, situationally speaking.
