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Nov 28, To prevent this, trees naturally seal off wounds after pruning, though they don't actually heal them. Instead, fresh tissue grows to cover the wounds, protecting them from decay and disease. If you. Jan 05, When trees are wounded, either intentionally through pruning or accidentally, it sets off a natural process of protection within the tree.

Externally, the tree grows new wood and bark around the wounded area to form a callus. Internally, the tree initiates processes to prevent decay. Some gardeners try to help along the natural processes by applying a tree wound dressing.