I have a lemon tree growing in a large pot in my house. I live in Idaho so the tree stays inside due to the cold temperature and strong winds. The tree is located in a sunny south facing window. It produces flowers (and lemons occasionally). It looks like its dying. It doesn't appear to ever get any new leaves on it. I've looked everywhere for care of this tree and have been unsuccessful. I'm not sure if I should prune it and if so when. What kind of fertilizer do I give it? Have I placed it in the correct light conditions? How moist does the soil need to be? I usually let it dry out between waterings. Any help would be greatly appreciated.