Pruning a Plum Tree

Question

I have 2 non-fruiting plum trees. Do they need to be pruned? If so, when and how much?

Answer 1

These articles should help: https://www.gardeningknowhow.com/edible/fruits/plum/plum-trees-not-fruiting.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-pruning.htm