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Structural pruning southern live oak

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Before pruning After pruning
The large branch on the left is nearly the same diameter as the trunk. The arborist is removing a portion of this branch to slow its growth rate. The pruned branch will grow slower now that it has been pruned. The main leader and trunk will grow slightly faster resulting in a stronger union due to the smaller aspect ratio. In other words, the branch will become smaller than the trunk over the next few years.
Two years later - before pruning Two years later - after pruning
The arborist is standing in the union that is about even with his head in the photo of the tree two years ago. The left codominant stem was shortened with a reduction cut shown at the front of the arborist's hard hat.

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