Survival of plumeria at that temperature is hard to imagine. Some varieties are so cold sensitive that they won't even survive at 32. It becomes awful iffy when you speak of temperatures in the mid to upper 20's. I learned that the hard way when I stored my plumeria in an unheated garage. Our temperature got down into the mid teens but never got above freezing for two days. That sort of temperature for Mississippi is very, very rare. I lost every single plumeria, several dozen of them.
