How large is it? How much sun is it getting? Is it sitting in a drip pan with standing water? How warm is the place where it is positioned? Have you fertilized it? We need lots of specifics about its environment.

If it needs light, buy a halogen work light with 2 lights. This will give warmth and light. If it is standing in water, it should not. The roots will rot. I seldom fertilize in the winter. It is easy to over-fertilize.

If it is in standing water, take it out and put a teaspoon of chlorine bleach in a gallon of water and water it immediately. Allow as much water to drain as possible. I recommend you buy a bottle of SuperThrive. Feed and water once with SuperThrive.

Please get back to ME about your tree's environment.