Joe, I don't think you are referring to the houseplant, "Rubber Tree", Ficus elastica. This is a tropical plant and does not like cold weather. It would surely die if temperatures get down into the 20's. I grow rubber trees (I have a small, tropical plant business), and because of lack of space, I had to leave out a dozen or so rubber trees this winter. I have lost every single one of them. I also lost lots of jade, dozens of aloe vera, and a dozen or more schefflera plants. I kept some of all of these in a greenhouse and had to take a chance with the rest.
