Can someone help me with my Medinilla plant, it needs to be repotted. it's been in the same pot for two years. I have it in the house for the winter, too cold in the greenhouse. What is a good mix to replant it in and when do I do it? I know about the humidity it needs, but would wecome some help as to what kind of potting mix to use, when to do it, and what kind of fertilizer is best for Medinilla magnifica.