Mallow Ninebark

Physocarpus malvaceus (Rosaceae) is a deciduous shrub native to the interior mountains of western North America. It grows 3 to 6 feet tall with arching stems and exfoliating bark. White to pinkish flower clusters appear in late spring. The maple-like leaves distinguish it from the closely related P. capitatus.

Mallow ninebark is adapted to drier sites than P. capitatus and tolerates well-drained, rocky soils in full sun to light shade. It is common in open forests and on exposed slopes. No significant pest or disease problems are documented. Hardy in Zones 4a to 8b.