Penny- that's a really nice looking plant. I have several members of the tribe in my shade house here in the Florida Keys. Our winters are normally dry and seasonably warm but this past fall into January have been wet and relatively chilly. Only 1 of my plants has gone dormant so I actually, just a few days ago, pulled them out of the shade house and put them downstairs under the house so they won't get any more rain. Typically by now all would have lost their leaves.
I'm attaching an interesting write-up that you may find useful on the subject.
https://www.aos.org/AOS/media/Conten...ries-Ctsm5.pdf