What Should I Do About My Plums That Fall Off Prematurely?

Question

Each year, my plums bloom and produce lots of early plums. Then when the plums are about a grape size, they begin to fall off. Maybe 10% will make to maturity . . .the rest fall off on the ground.

Answer 1

This happens due to poor pollination. These articles have some suggestions for improving attracting pollinators to your yard, which will result in more flowers pollinated and less fruit being aborted by the tree.
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-a-pollinator-garden.htm