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Why prune - Weak form develops over time

Why prune | Tree structure | Pruning cuts | Prune at planting | Structural pruning | Sub-standard pruning | Is pruning needed
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This tree was planted with two codominant stems and was never pruned to a dominant leader (left). Two simply cuts at planting, or soon after, could have prevented this.

Codominant stem with bark inclusion Tree is destroyed

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