I recently inherited an umbrella tree and it has been dropping leaves like crazy. After reading your tips, I believe I have over watered it. What, if anything, can I do to save this tree? I have only watered once a week when the soil began to be dry on top. I've had the plant since July 6th with no new sprouts and many of the leave are turning yellow. The plant is in my living room positioned in a corner in front of my window so it gets light but not lots of light because it faces south.