Panicle Hydrangea

Panicle Hydrangea (Hydrangea paniculata)

Peegee Hydrangea, Hardy Hydrangea

Full to part sun, moderately moist to well-drained, tolerates clay; pH 5.5–7.0; the most heat- and sun-tolerant hydrangea species for Tennessee conditions.

8–15 feet in species form; cultivars range widely — 'Limelight' reaches 8–10 feet, 'Little Lime' stays 3–5 feet, 'Vanilla Strawberry' 6–8 feet; blooms July–September on current year's wood (new wood) with large conical white flower panicles that age to pink or burgundy; deciduous.

Propagation: softwood cuttings in early summer root readily.

Native region: Not native to Tennessee; ornamental introduction from China and Japan.

Panicle hydrangea is the most reliable-blooming of the hydrangea species in Middle Tennessee because it flowers entirely on new wood — late spring freezes that wipe out Hydrangea macrophylla buds have no effect. Full sun siting, which would stress other hydrangea species, actually intensifies the flower development and fall color transition from white to deep pink. The species and larger cultivars can be trained as single- or multi-trunk small trees, which improves air circulation and reduces powdery mildew pressure. Prune in late winter or early spring before bud break — cutting back by one-third promotes vigorous new growth and larger flower heads. Cultivar selection largely determines maintenance burden; compact types need minimal pruning and suit smaller residential lots better than the vigorous species form.