Answer: Dogwood (Cornus florida) is naturally a horizontal branching tree, so what you are seeing may be the natural shape developing. In general it is best to avoid pruning these trees as the pruning cuts leave an open invitation to potential pests such as borers. In a new tree, it would be unusual to see a need for pruning in any case, it should have been well formed at the nursery. Without seeing the plant I would suggest the most conservative course of leaving it alone. Over the years it should develop into a characteristically beautiful tree with an individualized shape and form that give it a unique beauty. Enjoy your dogwood!
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