I have a couple "Kagzai Nibu" (lemons with a very thin skin) variety in flower pots. One of them has lost a few leaves (I read your articles regarding loss of leaves). It has flowers blossoming on its branches; however, I notice that once the pollination has taken place and the small fruits begin to form (a few millimeters in diameter or a little larger), they simply fall off the shrub. The other is healthy but does not flower. Hence, I am completely lost and need your help.