Answer: Citrus drop is a natural occurence. The tree drops fruit so that other fruits can get larger, and because if all the fruit developed, the weight would break the branches! Other reasons for small fruit to drop are poor pollination and water stress. Citrus is extremely moisture-dependent and needs fertilizing three times per year with nitrogen. If you are not feeding or watering adequately, that may be the reason some of the fruit is dropping. Water your tree slowly and deeply so that the water moves past the root zone and out past the tree's canopy. Fertilize in Jan/Feb, April/May and Aug/Sept. with 1/3 of the tree's annual requirements for each feeding. Water thoroughly before and after applying fertilizer and follow package instructions. I hope this info helps!
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