Genus: Ninebark

Physocarpus

Photo/Illustration: 
Courtesy of Harold Pellett, the Landscape Plant Development Center
Ninebark (Physocarpus)
fy-so-KAR-pus
Rosaceae
This genus of fewer than a dozen shrubs is grown for its peeling bark, attractive leaves, and cup-shaped white flowers. Some ninebarks are native to North America. Use them as a hedge or screen, in a shrub border, or in a naturalized planting.
Care:  Provide full sun or partial shade and acidic, rich, moist but well-drained soil.
Propagation: 

Start seeds indoors in spring or fall, or take cuttings in summer.

Species, varieties and clutivars for genus Physocarpus

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Ninebark
Physocarpus opulifolius 'Center Glow'
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Diabolo® ninebark
Physocarpus opulifolius 'Monlo'
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Summer Wine ninebark
Physocarpus opulifolius 'Seward'
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'Nugget' ninebark
Physocarpus opulifolius ‘Nugget’
Problems: 

Relatively problem-free, but leaf spots, fireblight, powdery mildew, and witches' broom sometimes occur.