Hydrangea arborescens is native to the eastern United States, found naturally along moist rocky slopes, ravines, streambanks, and bluff bases. It is the most common native hydrangea in North Carolina and one of the most cold-hardy hydrangeas available to any gardener, performing reliably from zone 3 through 9. The species epithet means "becoming tree-like," though in practice it behaves more like a generous herbaceous perennial: pruned hard to near ground level in late winter, it sends up vigorous new stems each season that carry very large, flat-topped or mounded flower clusters in cream and white through summer. The tradeoff is that those large heads on new growth can droop after heavy rain; siting and cultivar selection help manage this.

Unlike the bigleaf hydrangeas, smooth hydrangea's flower color is not influenced by soil pH. It requires neutral to acidic, well-drained soil and prefers partial shade, though it will tolerate full sun with reliable moisture. It is deer, rabbit, and salt resistant, grows well on slopes, and naturalizes comfortably in woodland settings. It serves as the host plant for the hydrangea sphinx moth (Darapsa versicolor) and attracts butterflies, moths, and pollinators broadly. For mass plantings, shade garden borders, or as a specimen at the woodland edge, few native shrubs match its combination of toughness, ecological value, and summer presence.