The best time to prune a plum tree is in June. When pruning, be sure to make clean cuts so the wood won't split or fray. If a cut is bigger than two inches, it may need a protective sealant or trimmed with a slant down toward the tree. Water damage is prevented this way.
If anything is sick, dead, or dying get rid of it. Remove any damaged pieces from the tree.
You want to leave a bud following each cut. When the original first branch is eight feet high, snip it so that it hangs three feet over the rest of the tree. Cut anything that didn't produce fruit, so that it will next year.
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