If there is a really cold winter will this hurt it?

Cut the plum tree's stem with pruning shears to 2 feet above the soil in the maiden, or first, year. Cut the stem directly above a bud, then remove the bud below the topmost bud.

Prune branches that don't bear fruit.

Jun 08, Prune when the buds are just bursting, or when the tree is just beginning to flower. Established plum trees that are more than three years old can be pruned in summer, from mid-June onwards. Again, the aim is to keep the tree a manageable size and shape, while allowing the fruit to ripen.

Prune.

Apr 11, A video on pruning plum trees - Dan Neuteboom shows us two mature plum trees, one of which has been pruned badly, while the other has been pruned well.

One w. Sep 21, If you have an old plum tree, you can slowly rejuvenate it, improving both tree health and fruit quality. Pruning the plum tree takes a few growing seasons.

Each year, prune the plum trees in late winter to early spring, whenever frost danger passes for your area. The University of California notes that a rejuvenation pruning for your plum tree will take three years.