INDOOR TREES: Satsuma Orange Trees

» RSonny1030 - Satsuma Orange Trees

I have two potted Satsuma trees about 5 years old. Both look fine and one is now in almost full bloom, with blooms just now appearing on the other. The trees look very healthy even after severe pruning last fall as they were getting too large. My problem is that last year after both trees went through extensive blossoming with many fruits appearing on both trees, all the small fruit dropped off one of the trees. I had to thin the fruit drastically on the other tree as the branches would not hold them, but still got about 60 very delicious satsumas from the one tree. Can you suggest what caused the fruit to drop off one of the trees? Is there something I can do to prevent this?

-- posted by RSonny1030