Pacific Ninebark

Physocarpus capitatus

Rosaceae

• Pacific Northwest Native
• USDA Zone 5-9
• Sun-Part Shade
• Size: 3'-8’ wide x 3'-8' tall
• Drought Tolerant: Moderate
• Evergreen: no
• Flower Color: Creamy white (April - June)
• Wildlife Value: Pollinator plant, bird cover, erosion control

Pacific Ninebark is a native deciduous shrub with an upright to arching growth habit forming a rounded shape. It grows naturally in moist woods, streambanks, and forest edges from British Columbia to California, thriving in full sun to part shade. The shrub develops multiple stems from the base with attractive exfoliating bark that peels in thin layers, revealing reddish-brown inner bark underneath. The maple-like leaves are palmately lobed with three to five lobes and toothed margins, creating a lush, textured appearance. It adapts to various soil types including coarse, medium, and fine textures.

From April through June, the shrub produces abundant clusters of small, creamy white flowers in rounded heads measuring 1 to 2 inches across. The flowers are rich in nectar and have a sweet fragrance that attracts numerous pollinators including native bees and butterflies. The blooms develop into small, inflated seed pods that turn reddish-brown as they mature, adding ornamental interest from summer through fall. The seed pods persist through winter, providing texture and food for birds. Fall foliage can show yellow tones before dropping.

Pacific Ninebark provides excellent habitat value for wildlife. The dense branching structure offers nesting sites and protective cover for birds and small mammals. Pollinators frequent the abundant flowers in spring, while birds feed on the seeds in fall and winter. The shrub's root system helps stabilize soil on slopes and streambanks, making it valuable for erosion control. It tolerates occasional flooding and adapts well to riparian restoration projects. The multi-season interest from flowers, seed pods, and exfoliating bark makes it an attractive addition to native landscapes.

This versatile shrub excels in mixed borders, hedges, naturalized areas, and streamside plantings. It works well as a specimen plant or massed for screening. Plant in full sun to part shade with moist, well-drained soil. Pacific Ninebark tolerates a range of conditions once established but performs best with consistent moisture. Combine with other Pacific Northwest natives like Mock Orange, Red-Flowering Currant, and Western Sword Fern. Prune after flowering to maintain shape or thin older stems to encourage new growth and enhance the exfoliating bark display.