Plum trees are lovely but left to themselves, they can become a burden. They tend to send up tall shoots, producing fruit toward the top that only the birds and squirrels can reach. Or they can produce so much fruit, limbs can break under the weight.
It’s important to prune a plum tree to maintain its health and promote fruit—this is done by providing channels of light throughout the tree so the fruit can mature.
Maintaining Plum Tree Health AND Promoting Good Fruit:
Some information provided by “Pruning Tree Fruit – The Basics” by Gary Moulton and Jacky King, Washington State University Mount Vernon Research and Extension Unit