Oakleaf Hydrangea

Oakleaf Hydrangea (Hydrangea quercifolia)

Oakleaf Hydrangea

Part shade to full sun, moderately moist to well-drained, tolerates clay and moderate drought once established; pH 5.5–6.5; the most drought-tolerant native hydrangea.

6–8 feet tall and wide in species form; blooms May–July on previous year's wood (old wood) with large conical white panicles 8–12 inches long aging to tan and papery; deeply lobed oak-like leaves turn burgundy-red in fall; peeling cinnamon-brown bark provides winter interest; spreads slowly by root suckers.

Propagation: softwood cuttings in early summer; semi-hardwood cuttings in late summer.

Native region: Native to Tennessee; primarily in moist rocky ravines, woodland slopes, and stream bluffs, concentrated in Middle and East Tennessee.

Oakleaf hydrangea provides four-season ornamental interest — spring and early summer bloom, summer foliage texture, vivid burgundy fall color, and exfoliating bark through winter — on a native shrub that establishes readily in Middle Tennessee clay soils. Unlike Hydrangea macrophylla, old-wood blooming is rarely disrupted by zone 7a winters; the buds are substantially hardier. Pruning should occur immediately after bloom concludes in July, removing only dead wood and spent flower heads — fall or winter pruning eliminates next season's flowers. The plant is highly tolerant of low-light conditions under deciduous canopy, making it one of the best choices for shaded north-facing exposures. No significant pest or disease problems affect established plants in Tennessee. Deer occasionally browse young plants but rarely cause lasting damage to established specimens.