My Lemon Tree Gets A Lot Of Flowers W/berries But They Always Fall Off.
I had this plant for 8+years...only 3 lemons
Certified GKH Gardening Expert
This can be quite normal, depending on the size of the tree, but excessive fruit drop is almost always due to environmental factors.
If this is an outdoor tree, you may not be able to control these factors. If this is an indoor specimen then you may be able to control one or more factors.
This article will help: https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-fruit-drop.htm