Hydrangea barbara is a deciduous to semi-evergreen woody vine native to the coastal plain and mountain areas of North Carolina, found naturally along bottomlands, swamps, and moist forest margins. This provenance matters: it is a plant evolved for humidity and damp ground, and it performs best when those conditions are honored in the garden. Site it in partial sun to partial shade with reliably moist to wet, fertile, acidic soil, and it will reliably climb. Aerial rootlets do the work, allowing it to grip brick, stone, wood, and trellises without additional support. Grown as a groundcover it will spread but will not flower, since blooms appear only on new wood produced by upward-climbing stems.

In spring, flat-topped clusters of white flowers — 2 to 4 inches across and fringed with numerous stamens — emerge among large, glossy oval leaves. Those leaves are the plant's other strength: they cover the vine from top to bottom, making it an effective screening plant for fences or structures where you want density rather than a tracery of stems. Leaf color fades to tan in fall, adding a warm note before drop. Propagation from seed is difficult; softwood cuttings taken in early summer are more reliable. Note that this plant carries a high flammability rating and should not be placed within the immediate defensible space around structures.