Western Ninebark Pacific Ninebark

Physocarpus capitatus (Rosaceae) is a deciduous shrub native to western North America from Alaska to California and east to Idaho and Montana. It grows 6 to 12 feet tall with an arching habit and exfoliating bark that peels in papery strips. Dense, rounded clusters of small white flowers appear in late spring, followed by reddish fruit capsules.

Pacific ninebark grows in full sun to part shade on moist to wet soils. It tolerates seasonal flooding and clay, making it useful for riparian restoration, rain gardens, and wet sites. No significant pest or disease problems are documented. Hardy in Zones 4a to 8b.