August 2017: Trunk Development – Part 4

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When to Prune
Most routine pruning to remove weak, diseased, or dead limbs can be accomplished at any time during the year with little effect on the tree. As a rule, growth and wound closure are maximized if pruning takes place before the spring growth flush. Some trees, such as maples and birches, tend to “bleed” if pruned early in the spring. It may be unsightly, but it is of little consequence to the tree.

A few tree diseases, such as oak wilt, can be spread when pruning wounds provide access to pathogens. Susceptible trees should not be pruned during active transmission periods.
Heavy pruning of live tissue just after the spring growth flush should be avoided, especially on weak trees. At that time, trees have just expended a great deal of energy to produce foliage and early shoot growth. Removal of a large percentage of foliage at that time can stress the tree.

Making Proper Pruning Cuts
Pruning cuts should be made just outside the branch collar. The branch collar contains trunk or parent branch tissue and should not be damaged or removed. If the trunk collar has grown out on a dead limb to be removed, make the cut just beyond the collar. Do not cut the collar.

If a large limb is to be removed, its weight should first be reduced. This is done by making an undercut about 11 to 17 inches from the limb’s point of attachment. Make a second cut from the top, directly above or a few inches farther out on the limb. Doing so removes the limb, leaving the 11 to 17 inches stub. Remove the stub by cutting back to the branch collar. This technique reduces the possibility of tearing the bark.

Going Forward With Your Tree Care
We look forward to helping you with all of your tree care and tree trimming needs. When, and if, you have any questions about your trees, shrubs, or any other greenery on your property, we can help. We look forward to hearing from you soon because we are your Kennewick tree care specialists.

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