Ninebark — Physocarpus opulifolius

Overview: Tough, cold-hardy native shrub with spring white to pinkish flower clusters, colorful foliage (by cultivar), and showy exfoliating bark that peels in strips (“nine” layers) for winter interest. Excellent for low-maintenance hedges, foundations, and slopes.

Size & habit (species): 5–10′ tall × 5–10′ wide, rounded, multi-stemmed; many compact cultivars available.

Growth rate: Moderate–fast.

Hardiness: USDA Zones 3–7(8).

Light: Full sun to part shade (best leaf color and bloom in full sun).

Soil & water: Adaptable—clay, loam, or sandy soils; pH tolerant. Prefers well-drained sites; drought tolerant once established. Avoid chronically wet spots.

Flowers, fruit & bark:

• Bloom: Flat-topped clusters (late spring/early summer), good for pollinators.

• Fruit: Red to bronzy seed capsules that can persist for late-season interest.

• Bark: Peels in papery strips on older stems—strong winter character.

Tolerance / concerns:

• Tolerant: Cold, wind, urban conditions, and pruning.

• Concerns: Powdery mildew on older green-leaf forms in shade/poor air flow; choose newer resistant cultivars and give sun/air movement. Generally deer-resistant.

Pruning: Flowers on old wood → prune right after bloom. For rejuvenation, remove 1/3 of the oldest stems at the base every 1–2 years, or cut back hard in late winter (sacrifices that year’s bloom but refreshes foliage color).

Landscape uses: Informal hedges/screens, mixed borders, mass plantings, erosion control on slopes, four-season foundation accents.

Spacing (on-center):

• Compact forms: 3–4 ft

• Standard forms / hedges: 4–6 ft

• Specimens: allow 5–8 ft, per cultivar size

Planting tip: Set root flare at or slightly above grade; apply 2–3″ mulch (off the stems) and water regularly the first season. For best foliage color and mildew resistance, give full sun and airflow.