Pacific Ninebark • Physocarpus capitatus
Growth Habit and Environment
Pacific Ninebark is a deciduous shrub that typically grows between 6 to 12 feet in height and spread. It has a multi-stemmed growth habit, often with several arching branches that create a rounded and bushy appearance. The shrub's branches are flexible and can easily be pruned to shape or size. One of the most distinctive features of Pacific ninebark is its exfoliating bark. The bark peels away in thin layers, revealing the layers beneath. The colors of the bark can vary, displaying shades of reddish-brown, tan, and even gray. It prefers well-drained soils but can tolerate a range of soil types, and is found most often in humid areas like streambanks.
Seasonal Cycle
In late spring, usually around May to June depending on the climate, Pacific Ninebark produces clusters of small, white to pinkish flowers after leaves have mostly unfurled. These flowers are borne in rounded inflorescences at the tips of the branches. The flowering period can last for a few weeks.
After flowering, flowers are replaced by small, reddish-brown fruit capsules. These capsules develop seed over the summer.
As the days grow shorter and temperatures begin to drop, the foliage of Pacific Ninebark undergoes a color transformation. Green leaves turn shades of yellow, orange, or reddish-brown. The intensity of colors can vary based on climate and soil conditions.
In late fall or early winter, leaves gradually drop from the branches, leaving the shrub bare and revealing its trademark exfoliating bark. The peeling bark layers, with their varying shades of reddish-brown, tan, and gray, remain visible and provide texture and interest to the winter landscape.
Planting Tips
Choose a location that receives either full sun to partial shade. Pacific ninebark can tolerate a range of light conditions, but it generally thrives in areas with dappled sunlight or filtered shade.
Ensure the site has well-draining soil. While Pacific ninebark can tolerate various soil types, good drainage helps prevent root rot and other water-related issues.
During the first growing season, monitor the soil moisture regularly. Keep the soil consistently moist but not waterlogged. Be especially vigilant during hot and dry periods. Once it is established (usually after the first year), it becomes more drought-tolerant and may not require as frequent of a watering.
Prune Pacific Ninebark selectively to shape the it and remove any dead or damaged branches. The best time for major pruning is in late winter before new growth begins.
Pacific ninebark is generally resistant to pests and diseases. However, keep an eye out for any signs of aphids, spider mites, or powdery mildew.
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