Answer: The tree will try to protect and heal itself by covering the wound -- just as it grows over the spot where a fallen branch had originated. Whether or not it will be successful depends on the extent of the damage and the overall health of the tree. You might help your tree by assuring it has adequate water during dry spells, and applying a balanced fertilizer in late fall after the leaves have fallen, but there is nothing you can do to the trunk itself. I'm sorry about your tree.
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