Shrub · Rosaceae
Common Ninebark
Physocarpus opulifolius
A tough native shrub that throws out peeling bark and colorful foliage and asks for next to nothing back.
Full sun
Every 7–14 days
USDA 2–8
5–8 ft · 1.5–2.4 m
Overview
Ninebark ranks among the easiest shrubs a gardener can plant, and it rewards the effort right away. This rose-family native of eastern North America laughs off cold down to zone 2, powers through drought once its roots dig in, and grows in nearly any soil you hand it. The name springs from the bark that peels away in thin papery strips, dressing the older stems with texture that holds all winter long.
The real draw now is the foliage, and it delivers. Breeders have coaxed out cultivars in deep purple, gold, copper, and wine-red, and clusters of small white-to-pink flowers pop open in late spring. On the dark and gold forms, the leaves keep the color rolling from the moment they unfurl until they drop in fall.
This fast, vigorous shrub craves room and sun, so hand it an open, breezy spot and it practically runs itself. Cram it into damp shade, though, and powdery mildew moves right in. Plant it well and you land a low-care backbone shrub that pays you back for years.
Care
The short version: give it full sun to fire up the leaf color, drop it into average well-drained soil it happily adapts to, and water only through that first season. After that it turns drought tough, barely wants feeding, and asks for just one prune a year, right after it blooms.
Light
Ninebark hits its stride in full sun, where the purple and gold cultivars keep their color blazing far better. It will get by in partial shade, but count on duller leaves and a bigger shot at powdery mildew once the air goes still.
Water
Water a new plant regularly through its first growing season to lock the roots in. After that it turns genuinely drought tolerant and wants a drink only through a long dry spell. Let the top half of the soil dry between waterings, which lands around every 7 to 14 days.
Soil
This shrub shrugs off soil fussiness entirely. It does best in average, well-drained soil but adapts to clay, loam, sand, rocky, dry, and even wet spots. It rolls with a wide pH from 5.5 to 8.0, so most gardens suit it straight off, no amending needed.
Temperature
Ninebark is seriously hardy, taking winter cold down to about -51°F (-46°C) and summer heat up to 100°F (38°C). That span covers hardiness zones 2 through 8, which is why it shows up in so many cold-climate gardens.
Humidity
Outdoor humidity is nothing to chase on its own, so skip hunting for a number. Airflow is what counts, since crowded, stagnant conditions are what pull powdery mildew onto the leaves.
Feeding
This tough native rarely needs feeding, so you can mostly leave it be. If growth looks weak, hit it with a light application of balanced fertilizer in early spring and stop there. Overdo it, especially the nitrogen, and you just push soft growth that fireblight pounces on.
Pruning
Prune right after it blooms and no later than mid-August, because next year's flowers form on old wood and a late cut strips them away. Got an overgrown, leggy one? Cut it close to the ground in winter and let it charge back fresh.
Repotting
Ninebark belongs in the ground and rarely needs potting on. If you do run one in a container, bump it up when the roots circle the pot, punch out the drainage holes, or water starts running straight through.
Size & spacing
Plan for a big, bold shrub, 5 to 8 feet (152 to 244 cm) tall with a spread of 4 to 6 feet (122 to 183 cm). Hand it that full width so air rushes through the branches and mildew gets far less of a foothold.
When to plant
Ninebark is a hardy shrub with a wide-open planting window, so you have plenty of room to plant. Set new plants out in spring or fall while the weather stays mild, then watch for the white-to-pink flowers bursting out in late spring, roughly April through June, before the colored foliage takes over for the rest of the year.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall
- Harvest: Late spring (April to June)
Hardiness
USDA hardiness zones: 2–8
Temperature: down to -46°C
Troubleshooting
Ninebark rarely throws you a curveball, and most of what does show up lands on the leaves rather than the whole plant. The handful of problems worth knowing trace straight back to crowding and damp, still air. Match what you spot below and jump on it before it spreads.
Shoot tips turn black and curl as if scorched
This one is fireblight, a bacterial infection that blackens the tips and yanks them into a shepherd's crook while they hang on to the branch. Move on it right away: cut the blighted wood out well below the visible damage, wipe your tools clean between every cut, and burn or bin what you pull rather than composting it. Ease off the nitrogen, prune on a dry day, and you shut the door on it coming back.
Fix:
- Prune out blighted wood well below visible damage
- Disinfect pruning tools between cuts
- Destroy removed material; do not compost
White, dusty film coating the leaves and shoot tips
Meet powdery mildew, a fungus that grabs hold wherever the air sits still and the shade lingers, and it hits the dark-leaved cultivars hardest. Get ahead of it fast: thin the crowded stems to send air moving through, snap off the worst leaves, and steer the shrub into more sun. It looks rough for a while, but the plant powers right through it.
Fix:
- Improve air circulation by thinning crowded stems
- Remove and dispose of badly infected foliage
- Site or move plants into full sun
Dark spots and blotches scattered across the leaves
Here come the fungal leaf spots, which spread when the foliage stays wet and the plants crowd in too close. They knock the shine off the shrub but almost never touch its health. Rake up the fallen leaves, open the planting to let air rush through, and aim your water at the base instead of over the top.
Fix:
- Rake up and dispose of fallen infected leaves
- Improve spacing and airflow
- Avoid wetting foliage when watering
Toxicity
Great news up front: there is nothing to fear here. Ninebark stays off the ASPCA poison lists and counts as non-toxic to pets, livestock, and people alike. The worst a big mouthful might do is a quick, mild stomach upset, the same as overdoing it on any leafy plant.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats can prowl right past ninebark without a care, since it never lands on the ASPCA poison list. Chew a leaf and the worst that follows is a little drool or a quick stomach grumble, exactly what any leafy plant would bring on.
Dogs None
Dogs get to romp through a garden full of ninebark with zero worry. Wolf down a big mouthful of leaves and the stomach might loosen for an afternoon, but there is no real poison here to fear.
Horses Safe
Horses can graze right up to a ninebark hedge and stay fine. The shrub packs no toxin that would harm them, and they mostly skip the woody stems anyway.
Rabbits Safe
Rabbits, pet or wild, take zero harm from ninebark. They love to nibble the young shoots, and the leaves go down easy on their digestion.
Livestock Safe
Cattle, goats, and sheep can graze around ninebark safely, since it holds nothing that would poison them. A goat may strip the tender growth clean and walk away just fine.
Birds Safe
Birds thrive around ninebark rather than fear it. Loads of them feast on the dry seed capsules through winter and pack their nests into the dense branches, all for the shelter it offers.
People Safe
Ninebark carries no poisoning risk for people. Nobody grows it for the plate, so there is no reason to taste it, but a stray nibble does no harm.
No special handling precautions are required; wear gloves when pruning if you have sensitive skin.
Varieties
Most ninebark on the shelf today is a colored-leaf cultivar, not the plain green species, and that is exactly where the fun is. These are the ones you are most likely to grab, sorted by the foliage they are grown for.
Diabolo
The famous dark one, flaunting deep purple foliage that can drift toward green through a hot summer.
Dart's Gold
Its bright golden-yellow leaves steal the show, and full sun keeps that color firing at its brightest.
Summer Wine
A compact powerhouse that plays dark wine-red foliage off crisp white-to-pink flowers.
Coppertina
New growth bursts out coppery orange, then deepens to red as the leaves mature.
Amber Jubilee
The foliage races through gold, orange, and amber, switching tones as the season charges on.
How to propagate
Ninebark hands you three ways to make more, and the one you pick just hinges on whether keeping a cultivar's leaf color true matters to you.
Stem cuttingsEasy
Late spring to summer using softwood cuttings · 4 to 8 weeks to root
Want a named colored-leaf cultivar to come back true to its parent? Cuttings deliver every time. Snap off softwood or semi-hardwood pieces from late spring into summer, and they strike roots in 4 to 8 weeks. This is the sure winner of the three.
SeedModerate
Sow in fall or after cold stratification in spring · Several weeks to germinate; seedlings of cultivars vary
Seed cranks out the wild species with ease, sown in fall or handed a cold spell before a spring sowing, and it sprouts across several weeks. Just know that seedlings from a colored cultivar roll the dice on leaf color and will not copy the parent.
LayeringEasy
Spring through summer · One growing season
Layering is the no-sweat winner. Pin a low arching branch down onto the soil any time from spring through summer, let it root over one growing season, then cut it free from the parent as a brand new plant.
Myths
The name ninebark means the bark peels off in exactly nine separate layers.
The name cheers on that showy bark peeling away in thin strips down the stems, not any actual count. Nine is an old figurative number here, a way of saying loads of layers rather than precisely nine.