Ninebark in Minnesota: A Complete Guide to Summer Wine, Little Devil, and Diabolo

Ninebark is a Minnesota native shrub that ranges from 3 to 10 feet depending on cultivar. Little Devil matures at 3 to 4 feet, Summer Wine at 5 to 8, and Diabolo at 4 to 8 and occasionally 10. All are hardy to zone 3, tolerate clay, resist deer, and bloom white to pink on old wood in late spring. Plant in full sun — dark-leaved cultivars green out in shade — and space at 80 percent of mature width.

Ninebark earns its place in Twin Cities landscapes for a reason no marketing copy captures well: it is one of the few shrubs that is genuinely native here, genuinely tough, and genuinely good-looking at the same time. The Minnesota Board of Water and Soil Resources describes common ninebark (Physocarpus opulifolius) as a shrub of streambanks, lowland forests, floodplains and field edges, distributed statewide and most prevalent in the southeast, capable of growing in either dry or moist soils. That is a plant built for the swings a Minnesota yard delivers.

This guide covers what ninebark is, the six cultivars Three Timbers Minnesota stocks and how they actually differ, what a multi-year cultivar trial found about powdery mildew resistance, spacing and sun requirements, planting and watering, the pruning approach that preserves the plant's form instead of destroying it, and the sites where ninebark is the wrong choice.

What ninebark is

Ninebark (Physocarpus opulifolius) is a fast-growing, arching, deciduous shrub native to eastern and central North America, including Minnesota, grown in landscapes for colorful foliage ranging from deep burgundy to bright gold, flat clusters of small white-to-pink flowers in late spring, red seed heads in late summer, and exfoliating bark that peels in strips to reveal layers of reddish-brown inner bark.

The common name comes from that bark, which supposedly peels in nine layers. It is the reason a mature ninebark still has something to look at in February, when everything else deciduous is a bundle of gray sticks — provided nobody has sheared it into a ball, which strips the older stems that carry the bark.

Quick facts

The six ninebarks we stock, compared

We also carry Fireside Ninebark if you want the largest multicolor option. Note the range on Diabolo: reference sources put it anywhere from 4 to 10 feet, and that spread is real — a Diabolo in good soil with no pruning gets much bigger than the tag suggests.

Powdery mildew: what a real cultivar trial found

Ninebark's reputation for powdery mildew comes almost entirely from a couple of early purple-leaved cultivars, and repeating "ninebark gets mildew" as a blanket statement is out of date. The Chicago Botanic Garden's Plant Evaluation Program, led by Richard Hawke, is running a comparative trial of 26 ninebark cultivars that began in 2019 as part of a planned six-year study, grown in zone 5b in full sun on alkaline clay-loam under minimal-care conditions — conditions close enough to a Twin Cities landscape bed to be useful.

Reporting three years in, Hawke wrote that mildew "has yet to be an issue in our trial" overall. Where it did show up, the picture was specific:

• Severe mildew in 2020 on exactly two cultivars: 'Center Glow' and Coppertina — two of the older, most widely planted purple-leaved selections. Both received the trial's low 2-star rating. Three Timbers does not stock either one.
• Minor infections appeared on 'Chameleon', Diabolo, 'Morning Star', 'Nugget', Summer Wine and Summer Wine Black.
• Top 4-star performers included Amber Jubilee, 'Dart's Gold', Festivus Gold, Panther, Red Robe, Sweet Cherry Tea, Tiny Wine and Tiny Wine Gold.

Two of the trial's top-rated cultivars — Amber Jubilee and Dart's Gold — are on our bench. Diabolo and Summer Wine showed minor infection, which is worth knowing but is not a reason to avoid them; both are dependable landscape plants and both are noticeably better than the 'Center Glow' generation. Little Devil and Ginger Wine are marketed by their introducers as mildew-resistant, and Little Devil's introducer describes it as mildew resistant and largely free of pest and disease issues.

The practical takeaway for a Minnesota yard: mildew on ninebark is mostly a siting problem now, not a genetics problem. Full sun and air movement solve it. A dark-leaved ninebark crammed against a north wall between a fence and a downspout will get mildew no matter which cultivar you bought.

Sun is not optional

Every dark-leaved and gold-leaved ninebark holds its color as a direct function of light. In six or more hours of sun, Summer Wine is genuinely wine-dark all season. In four hours it drifts toward muddy green-purple. In real shade it goes green, stretches, thins out, and becomes the mildew-prone plant everyone complains about.

Purple foliage can also green up somewhat during hot midsummer stretches even in full sun — that is normal for the purple-leaved group and it recolors as temperatures fall. Gold cultivars have the opposite issue: Dart's Gold can scorch on the west side of a light-colored wall in a brutal July, where the reflected heat is worse than the sun itself.

Spacing and hedge math

• Mass planting: space at roughly 80 percent of mature width. Little Devil at 3 feet on center, Amber Jubilee at 4, Ginger Wine at 4½, Summer Wine at 5, Diabolo at 5 to 6.
• Informal screen: Summer Wine or Diabolo at 5 feet on center closes into a solid 6- to 8-foot mass in about four seasons. It is deciduous, so it screens from May through October only.
• Plant count: divide the run length in inches by the on-center spacing and add one. A 40-foot bank at 60 inches on center is 480 ÷ 60 = 8, plus one = 9 plants.
• From a foundation: at least half the mature width plus a foot. A Summer Wine needs 4 feet of clearance to the wall. This is where most ninebark regret starts.

Planting: window and method

Ninebark is deciduous, so it gets the long fall window. Three Timbers plants container and balled-and-burlapped deciduous stock through the end of October — evergreens are the ones we stop planting mid-to-late September. Metro ground freeze runs roughly November 10 to 25.

Fall is the best planting season here for hardy deciduous material. Late April through May is second, and June through early August is the window to avoid.

• Dig two to three times the root ball width, no deeper than the ball is tall. Set the top of the ball at or slightly above grade.
• Backfill with the native soil. Ninebark tolerates our clay-loam without amendment, and heavy amendment of a single hole in clay just encourages roots to stay in the hole.
• Score circling roots on container stock before setting it.
• Mulch 2 to 3 inches, pulled back from the stems.
• Site for airflow. Ninebark is one plant where being generous with spacing pays a disease dividend, not just an aesthetic one.

Watering

Five gallons per plant, once a week, for the first two full summers. Rainfall counts toward the total, and deep-and-weekly beats shallow-and-daily. Year two matters as much as year one — it is where most avoidable losses happen. From year three, established ninebark is drought-tolerant enough to need water only in an extended dry stretch.

Scale up for larger stock: a #10 wants roughly 10 gallons, a tree-form Summer Wine closer to 15. For the arithmetic that turns those gallons into minutes on your hose or drip line, see How Long to Water New Plants in Minnesota.

Pruning: renewal, not shearing

Ninebark blooms on old wood, and its whole appeal is an arching, layered habit with peeling bark on the older stems. Both facts point at the same technique.

The right approach — renewal pruning. Every three to five years, cut the oldest, thickest one third of the stems all the way to the ground. Do it in late winter before growth resumes, or immediately after flowering if you want to keep that year's bloom. The plant sends up new canes, the interior opens for air, and the natural fountain shape stays intact. Light shaping cuts to control size are best done right after flowering in June.

The hard reset. A neglected, overgrown ninebark can be cut to 6 to 12 inches in late winter and will regrow vigorously. You lose that year's flowers and the mature bark, and it takes two or three seasons to look like a shrub again — but it beats removing the plant.

What not to do. Do not shear ninebark into a ball or a box. Shearing produces a dense outer shell with a dead, dark interior, removes the older stems carrying the exfoliating bark, and traps humid air inside the canopy — which is exactly how you manufacture the mildew problem you were trying to avoid. If you find yourself shearing a ninebark twice a year to keep it off a walk, the real problem is that the cultivar is too big for the space. Replace it with Little Devil.

Problems you will actually see

• Powdery mildew. Covered above. Site in full sun with air movement, choose a resistant cultivar, and prune for openness rather than density. Cleaning up fallen leaves in autumn reduces reinfection.
• Foliage greening in midsummer. Normal on purple cultivars during hot stretches; color returns as nights cool.
• Leaf scorch. Brown crispy margins in July on a gold cultivar against a hot reflective wall, or on any ninebark that has been underwatered in its first two seasons.
• Rabbits. They clip stems at the snow line. An established ninebark shrugs it off and regrows from the base — one of the real advantages of a multi-stemmed native shrub. A first-winter #2 container is worth protecting with hardware cloth if you have visible rabbit runs.
• Deer. Ninebark is on the resistant list with juniper, spruce, spirea, lilac, potentilla and ornamental grasses. Deer pressure in the metro is heaviest west and southwest of I-494, and deer-resistant is not deer-proof.
• Legginess with a bare base. Not a disease — that is an unpruned ninebark that has never had old canes removed. Renewal-prune it.

Where ninebark fails — don't plant it here

• In a narrow foundation strip. The single most common ninebark mistake in the metro is a Summer Wine or Diabolo planted under a picture window in a 3-foot bed. Within four years it is over the sill and being sheared into a box twice a year, which ruins the plant. Use Little Devil at 3 to 4 feet, or move the big ones to the back of a deeper bed.
• In shade. Ninebark tolerates part shade; it does not perform there. Foliage color washes out, the habit gets leggy, and mildew risk climbs. If your site is genuinely shady, plant something else.
• As a year-round privacy screen. It is deciduous. A Diabolo hedge screens beautifully from May to October and is a see-through tangle of sticks from November to April. For four-season screening you need an evergreen — and on an exposed property line with deer and rabbit pressure our position is that juniper makes a better hedge than arborvitae.
• In standing water. Ninebark handles moist ground and seasonal fluctuation far better than most shrubs — it grows along streambanks and floodplains in the wild — but a spot that holds water for weeks is still too much. Ninebark is a good choice for a rain garden's upper slope, not its bottom.
• As a formal, clipped hedge. If you want a crisp geometric hedge, buy boxwood. Ninebark is an informal, arching, native-looking plant, and every attempt to make it something else ends with an unhappy shrub.

What to plant with ninebark

Ninebark is the back or mid-layer of a bed. The classic zone-4 pairing is a dark ninebark behind gold foliage: Summer Wine with Golden Mound Spirea or Magic Carpet Spirea in front is about as high-contrast as hardy shrubs get, and both are deer-resistant and clay-tolerant. Dwarf Korean Lilac beside it adds fragrance and mid-May bloom that finishes before the ninebark's seed heads color up. Feather reed grass and little bluestem work well at the ninebark's feet in a naturalistic planting, and because ninebark is a Minnesota native that supports pollinators and provides songbird cover, it fits a native-leaning design without any compromise.

Frequently Asked Questions

How big does ninebark get in Minnesota? It depends entirely on cultivar. Little Devil matures at 3 to 4 feet tall and wide, Dart's Gold at 4 to 5, Amber Jubilee at 4 to 6, Ginger Wine at 5 to 6, Summer Wine at 5 to 8, and Diabolo anywhere from 4 to 8 feet and occasionally 10. Buy for the mature size, not the pot.

Does ninebark get powdery mildew? Some cultivars do. In the Chicago Botanic Garden's ongoing ninebark trial, mildew was largely a non-issue overall, with severe infection in 2020 limited to 'Center Glow' and Coppertina, and minor infection on Diabolo, Summer Wine and a few others. Full sun and good air circulation prevent most of it.

Is ninebark native to Minnesota? Yes. Common ninebark (Physocarpus opulifolius) is native to Minnesota and distributed statewide, most prevalent in the southeast, growing along streams and rivers, in lowland forests, floodplains and field edges. Garden cultivars are selections of that native species.

When should I prune ninebark? Ninebark blooms on old wood, so shape it immediately after flowering in June. Renewal pruning — removing the oldest third of the stems at ground level every three to five years — can be done in late winter or after bloom. Never shear it into a ball; that destroys the arching habit and traps humid air inside the canopy.

Do deer eat ninebark? Ninebark is on the deer-resistant list along with juniper, spruce, spirea, lilac, potentilla and ornamental grasses. Deer-resistant is not deer-proof, and under heavy pressure deer will sample it. Rabbits clip stems at the snow line, but established multi-stemmed ninebark regrows from the base.

What is the difference between Summer Wine and Diabolo ninebark? Diabolo is the original purple-leaved ninebark, larger and coarser at 4 to 8 feet with broad deep-purple leaves. Summer Wine is more refined — finer, more deeply cut wine-dark foliage at 5 to 8 feet, developing an arching fountain habit at maturity. Summer Wine suits a landscape bed better; Diabolo suits a big informal screen or a bank.

Which ninebark is best for a small yard? Little Devil, at 3 to 4 feet tall and wide with fine-textured burgundy foliage. It is the only ninebark that genuinely fits a standard foundation bed without annual shearing. Dart's Gold at 4 to 5 feet is the next step up and adds bright gold foliage and good winter bark interest.

Can ninebark grow in clay soil? Yes. Ninebark tolerates a wide range of soils including clay, dry soil and shallow rocky ground, and it handles both dry and moist sites. Backfill with the native soil rather than amending heavily. What it will not tolerate is ground that holds standing water for weeks.

Why is my purple ninebark turning green? Two causes. Purple-leaved cultivars naturally green somewhat during hot midsummer stretches and recolor as nights cool. The other cause is insufficient sun — foliage color on dark cultivars is a direct function of light, and in less than six hours of sun a Summer Wine will drift toward muddy green and stay there.

Ready to plant ninebark?

Three Timbers Minnesota delivers ninebark across the Twin Cities metro, from Dart's Gold at $20.99 in a #2 to Summer Wine tree forms at $183.99. If you have a small bed, start with Little Devil; if you need a big informal screen, Diabolo is the workhorse. Browse the full shrubs collection. Free delivery on orders over $200, usually in 2 to 4 business days, and our crew can plant them for you at $12 per #2, $15 per #3 and $20 per #5 — no minimum job on plant delivery and planting. Pair ninebark with spirea in front and Dwarf Korean Lilac alongside, and read Why New Trees Die in Minnesota before anything goes in the ground. Call or text 612-214-1955.