September is when next spring's dogwood blooms get decided — per University of Georgia Extension, flower buds become visible now, which means you can already see how heavy next spring's bloom will be.
Appalachian Snow is a disease-resistant selection of Cornus florida, Georgia's native flowering dogwood and one of its most widely planted ornamental trees. Unlike sun-loving crape myrtles, dogwoods do best sited with some shade — UGA Extension notes they're naturally an understory tree, and while too much shade reduces flowering, full baking sun isn't ideal either. A spot with dappled or afternoon shade is the sweet spot.
Container-grown trees like this one can be planted any time with regular watering; if you've ever bought bareroot or balled-and-burlapped dogwoods, those specifically need the dormant window (November–March).
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Source: University of Georgia Cooperative Extension — Growing Dogwoods (Circular 900)