I have an avocado tree that is about three years old and about 20 inches high. I put it outside every summer and bring it in for the winter. This fall when I brought it in it was healthy, however all winter I have been struggling with drying leaves. It starts almost immediately as the leaves form as browning on the edges. They slowly dry up from the edges to the stem and then fall off. Has anyone had a similar problem? It is dry in our house, as we do not run a humidifier, so I am suspicious this may be the problem.