I have a Kentucky Coffeetree that I’ve been keeping indoors so that I can plant it outside in the spring. However, it has begun to develop a serious problem with its leaves. They have begun to turn yellow, progressing from the leaf margin towards the center. Some of the leaves have symptoms similar to chlorosis, with yellowing between veins. Other leaves have completely yellowed, including the veins. I can’t seem to find a conclusive answer on whether this is a nutrient deficiency, environmental problem, or a disease.