They will die if they freeze. Not sure about the Chinese plum but that is a tropical too, I believe. They have to be indoor in your zone. So bring them in when night temps are below 55 for extended periods. I let them be outside a little longer. The plants will slow down a lot in winter especially if the temperature consistently stay colder than 55F.

Thank you so much :) we have a big problem with deer here, I try to keep valuable plants indoors if I can to keep them from being eaten. I feel much better knowing they can stay in

All of them will need bright light and a little warmer during the day say 65 will be helpful for them. A south facing window is ideal. I use supplemental lights that I keep on a timer for 12 hrs. Keep about a 6 inches or so off the window or they may get pretty cold and suffer.