My grapefruit is about 1. 5 inches in diameter and they starting to fall from tree so early.
Certified GKH Gardening Expert
The trees will shed some fruit if it feels it is unable to support all the fruit that it has, so some loss is normal. But, if you feel the tree is dropping a lot of fruit, you could either have a pollination issue or the tree may be lacking water or nutrients and is shedding fruit to try to preserve itself. Make sure you are attracting pollinators and increase water to the tree when it first starts developing fruit.