PL. —Physocarpus opulifoliusBotanical illustration — drop image
Physocarpus opulifolius

Ninebark

SpringSummer
2b7bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
Not in bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Ninebark is a deciduous shrub native to eastern North America in the rose family Rosaceae, growing 5–10 feet tall with strongly arching stems. It is named for its exfoliating bark, which peels in thin papery layers to reveal shades of cinnamon, orange, and gray underneath. Modern cultivars have expanded its landscape value considerably, with foliage ranging from deep burgundy ('Diablo', 'Summer Wine') to copper-orange ('Coppertina') to lime green ('Dart's Gold').

Highly adaptable, ninebark tolerates clay, compacted, wet, and periodically dry soils across a wide pH range — a quality rare among ornamental shrubs. Clusters of small white to pale pink flowers in late spring attract native bees and bumblebees. The reddish papery seed clusters that follow persist into winter and feed birds. Full sun produces the most intense foliage color in dark-leaved cultivars; part shade causes the same cultivars to green up. The shrub spreads slowly by basal suckers; remove unwanted stems annually. Prune the oldest canes to the ground every few years for vigorous rejuvenation rather than shearing the top.

Various Indigenous peoples used bark preparations as a purgative and emetic, and applied bark extracts topically for skin irritation and eye inflammation. The species supports a broad range of native pollinators and provides dense low nesting cover for birds.

Care guide
SunFull sun to part shade
Water1 inch per week until established; drought tolerant after
SoilAdaptable; pH 5.0–8.0
Spacing5–8 feet
Height6–10 feet
Zone2b – 7b
Native RegionAL, AR, CT, DE, DC, GA, IL, IN, IA, KS, KY, ME, MD, MA, MI, MN, MS, MO, NE, NH, NJ, NY, NC, OH, OK, PA, RI, SC, SD, TN, VT, VA, WV, WI
Frost hardy
Seasonal tasks
winter
cutFor full rejuvenation on an overgrown or declining plant, cut all stems to 6–12 inches above the ground before buds swell; the shrub regenerates readily.
spring
watchCheck new shoot tips for aphid colonies; dislodge with a strong stream of water or apply insecticidal soap if populations are heavy.
sowPlant bare-root or container-grown ninebark at the same depth as the container; water deeply after planting and weekly for the first growing season until established.
summer
watchInspect foliage in humid weather for powdery mildew — a white or gray coating on leaf surfaces; thin interior stems to improve airflow if it appears.
cutRemove one-third of the oldest, thickest canes at the base immediately after the flowers fade to encourage vigorous new growth and maintain an open framework.
fall
cutRemove basal suckers that extend beyond the desired footprint and cut out any dead or crossing stems.
Common problems

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.

Fire Blight

Symptoms

Water-soaked, wilting blossoms and young stems that rapidly turn brown to black. Infected shoot tips curl into a characteristic shepherd's crook. Bark beneath the infection may show reddish-brown discoloration.

Treatment

Prune infected wood 8–12 inches below visible symptoms during dry weather. Sterilize tools with 70% isopropyl alcohol or a 10% bleach solution between cuts. Avoid high-nitrogen fertilizers that produce soft, disease-susceptible growth. Copper-based bactericides applied at early flowering can reduce spread in high-pressure years.

Cercospora Leaf Spot

Symptoms

Small round spots with tan or gray centers and reddish-purple borders on leaves. Spots merge in severe cases, causing leaves to brown and die back.

Treatment

Remove infected leaves and avoid overhead watering. Space plants for airflow and rotate crops. Apply a copper-based fungicide if the infection spreads.

Pests

Aphids

Aphididae
Symptoms

Clusters of small soft insects on new growth and flower buds.

Treatment

Knock off with a strong jet of water. Ladybirds and lacewings are natural predators. Insecticidal soap as last resort.