Why flowers fall on my lemon tree.
Why Flowers Fall on My Lemon Tree
Certified GKH Gardening Expert
How old is the tree? If it is a young tree, it is probably purging the buds because it is still too small to support the fruit the buds would produce. This is normal. In fact, I would recommend that until the tree is 2 years old, you remove any blossoms it produces so that it can focus on becoming well established rather than on growing fruit. It will be better for the long term health of the tree.
If you have an older tree, the following article should be of some help to you as lemons and limes are similar in their growing conditions: https://www.gardeningknowhow.com/edible/fruits/lime/is-lime-fruit-and-lime-blossoms-falling-off-tree-normal.htm