My Finger Lime has been growing in full sun (summer/winter/fall) from its beginning. It is a container tree, growing in a 15-gallon container. I fertilize it with a 25-5-15 fertilizer (5-1-3 nutrient ratio) every third watering. the tree is now 5 years old. Seeing a picture of your tree, would be very helpful in making a diagnosis of its problem,