My Meyer lemon has been blooming since September, but all of the baby lemons drop. It is still in its nursery pot, and I am planning to repot in the spring, since I am starting to see the roots when I look into the holes at the bottom of the pot. I feed it with foliage pro, diluted to 1/4 strength, whenever I water. I water about once a week, and the water drains fairly quickly. It's inside and in a window with western exposure, gets good light, and I use a supplemental grow light on cloudy days. What could be the problem?