Dig a hole slightly deeper than the root ball and twice as wide. What is that white powder on your ninebark? 1990 Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics, p. 315322. Best in full sun to light shade in well-drained soil. The common name of ninebark originates from the exfoliating bark that peels in layers when plants mature. Provide mulch around the base annually to help the plant retain moisture and to prevent weeds. 2015 Characterization of quinone outside inhibitor fungicide resistance in Cercospora sojina and development of diagnostic tools for its identification Plant Dis. There are many ways to incorporate ninebark into your landscape. 2 89 101, Gubler, W.D., Nguyen, T.T. The white fungus growing on your ninebark plant is powdery mildew. Your plants can recover if you treat the disease right away. applied) significantly controlled the powdery mildew disease severity and disease progression in both experiments. Badly damaged branches can be pruned away to avoid most diseases. Pale pink buds open to white flowers, with red seedheads later in the season. 1, Efficacy of sanitizers, biorational products, and fungicides in management of powdery mildew on ninebarkExpt. Powdery mildew on viburnum Identifying Powdery Mildew: White to gray powdery spots, blotches or felt-like mats form on leaves, green stems and buds. White flowers; new leaves start out orange with yellow veins, holding their color into summer, transitioning to purple in fall. Apply fertilizer only at the manufacturer's recommended rate. 2012 Evaluation of whole effluent toxicity data characteristics and use of welchs t-test in the test of significant toxicity analysis Environ. Powdery mildew is also suspected to occur on Pacific ninebark (P. capitatus). Alternate, 3 to 5 lobed simple leaf. Whenever possible grow ninebarks and other powdery mildew susceptible plants in full or morning sun. We will appreciate if you suggest us what can be done to get rid of the white fungus from the 9 bark bush leaves. Symptoms White superficial powdery colonies on leaves, stems, inflorescences and infructescences. The weather conditions have been right for this disease to occur. Purple ninebark is a cultivar of common ninebark (Physocarpus opulifolius), also referred to as Eastern ninebark. Jefam) Spray until the neem oil drips from all Diabolo's surfaces, including the backs of the leaves. Fortunately a healthy plant can tolerate the damage. Common ninebark (Physocarpus opulifolius)is a deciduous flowering shrub widely used in landscaping. I have seen quite a bit of powdery mildew on ninebark this spring. Delivery also avalable in the Twin Cities. Online publication. Features. Plant Pathol. common ninebark; ninebark; Atlantic ninebark; eastern ninebark. Make the bottom cut just below a node and the top cut about 1/2 inch above a node. Thank you. Mounding compact habit, 3-5 feet tall and wide. Avoid excessive pruning of infected plants during the growing season. * Required | We will never sell or distribute your email to any other parties or organizations. Wind spreads powdery mildew spores from plant to plant, but they only germinate if the leaves they land on are dry. These ninebark shrubs grow 8 to 10 feet (2-3 m.) tall and 5 to 6 feet (1.5-2 m.) wide. More about the newsletter. Use size at maturity as a spacing guide when planting. Disease is often most severe on young leaves and green shoots. & Malathrakis, N. 2006 Efficacy of Milsana, a formulated plant extract from Reynoutria sachalinensis, against powdery mildew of tomato (Leveillula taurica) BioControl 51 375 392, Lebeda, A., McGrath, M.T. University of California Cooperative Extension, Department of Plant Pathology, Davis, CA. (common ninebark), flowers.
Mix one tablespoon baking soda plus one teaspoon insecticidal soap OR lightweight horticulture oil (these serve as a spreader sticker) in a gallon of water. Learn More, 2023 Melinda Myers All rights reserved | How to Grow and Care for Rockspray Cotoneaster, How to Grow and Care for Bridal Wreath Spirea, How to Grow and Care for Doublefile Viburnum Shrubs, How to Grow and Care for Amber Jubilee Ninebark, How to Grow and Care for Emerald Gaiety Wintercreeper, How to Grow and Care for Catawba Rhododendron, Common ninebark, ninebark, eastern ninebark, Gather your pruning shears, rooting hormone, a zippered plastic bag, and sphagnum moss or wood shavings. Powdery mildew resistant varieties are available for many ornamental shrubs. PCR protocols: a guide to methods and applications. Summer Wine is an easy way to introduce wine-colored foliage into the home garden. & Sedlkov, B. Copyright 2023. In: M. Innis, D. Gelfand, J. Shinsky, and T.J. White (eds.). We are Brighton Township an Leaves on our 9 Bark bushes in the front of the house have gotten white with fungus or powdery stuff first time this year. Coppertina blooms throughout midsummer. This disease spreads when wind and splashing rain disperse the fungal spores onto uninfected leaves. Pruning . Not for nursery or greenhouse use. Ninebark is available in many sizes, ranging from 5 to 10 feet high and 6 to 8 feet wide at maturity. Low-growing shrub (under 3 feet), Small shrub (3-5 feet), Large shrub (more than 8 feet), Medium shrub (5-8 feet), Full sun (6 hrs direct light daily), Partial sun / shade (4-6 hrs light daily), Zone 2, Zone 3, Zone 4, Zone 5 (Northern Illinois), Zone 6 (City of Chicago), Zone 7, Acid soil, Alkaline soil, Moist, well-drained soil, Alkaline soil, Clay soil, Dry sites, Occasional drought, Occasional flooding, Road salt, Wet sites, midwinter, late winter, late spring, early summer, midsummer, late summer, early fall, mid fall, late fall, Physocarpus opulifolius (L.) Maxim. Her thousands of published articles cover topics from travel and gardening to pet care and technology. Gent 55 1007 1014, Konstantinidou-Doltsinis, S., Markellou, E., Kasselaki, A.-M., Fanouraki, M., Koumaki, C., Schmitt, A., Liopa-Tsakalidis, A. White diseased bark on your ficus tree is caused by southern blight. InTech, Rijeka, Croatia, Lubell, J., Brand, M. & Lehrer, J. Plant in any type of soil as ninebark thrives in dry, moist and wet soils with either acid or alkaline pH levels. Emerging Insect Pests in the Pacific Northwest, Brown Marmorated Stink Bug: An Emerging Threat to Pacific Northwest Agriculture, Spotted-wing Drosophila: An Emerging Berry and Stone Fruit Pest, How to Reduce Bee Poisoning from Pesticides, Horticultural, Landscape, and Ornamental Crops, Field Characteristics of Fruit-Tree-Attacking Spider Mites in the Pacific Northwest, Pests of Cabbage and Mustard Grown for Seed, Pests of Rutabaga and Turnip Grown for Seed, Biology and Control of the Garden Symphylan, Bean, Dry Cultivar Resistance to Bean Common Mosaic, Grape (Vitis spp.) Academic Press, San Diego, CA, Characterization of quinone outside inhibitor fungicide resistance in, and development of diagnostic tools for its identification, Management of powdery mildew in squash by plant and alga extract biopesticides, Evaluation of whole effluent toxicity data characteristics and use of welchs t-test in the test of significant toxicity analysis, (L.) Maxim Donna May: A new compact, purple-leafed landscape shrub, Journal of American Society for Horticultural Science, Diversity & Inclusion Statement/Code of Ethics, National Center for Biotechnology Information, 2020, Fungicide Resistance Action Committee, 2020, https://ucanr.edu/sites/eskalenlab/files/311062.pdf, https://www.frac.info/docs/default-source/publications/frac-code-list/frac-code-list-2020final5d632b2c512362eb9a1eff00004acf5d.pdf?sfvrsn=f940499a_2, http://plantpathology.ucdavis.edu/intranet/199597.pdf, https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-percarbonate, https://ucanr.edu/sites/eskalenlab/files/311057.pdf. Diabolo (syn. Wash. 87 356 370, White, T.J., Bruns, T.D., Lee, S. & Taylor, J. Sulfur (not for sulfur sensitive plants like viburnum). Water on the leaves prevents the light airy spores from moving on the wind. An upright, spreading, dense shrub with arching branches reaching 6 to 10 feet tall and wide.Cultivars vary in size and leaf color. This species is native to the Chicago Region according to Swink and Wilhelms Plants of the Chicago Region, with updates made according to current research. Others like to cut the bush 3 to 4 inches from the ground. Powdery mildew does not cause significant damage to the health of the tree and does not require management. Photo: Rock Gigure / Millette Photomedia. Ninebark needs ample sunlight in order to show its beautiful white blooms each spring. Persistent papery seed capsules attract seed-eating birds. Relative Disease Susceptibility and Sensitivity to Sulfur, Tomato (Solanum lycopersicum)-Tomato Varietal Resistance to Fusarium Wilt and/or Crown and Root Rot, Tomato (Solanum lycopersicum)-Varietal Resistance, Diagnosis and Management of Phytophthora Diseases, APHIS List of Regulated Hosts and Plants Proven or Associated with Phytophthora ramorum, Plants Resistant or Susceptible to Armillaria Root Rot, Verticillium Wilt in the Pacific Northwest, Plants Resistant or Susceptible to Verticillium Wilt, Plants Susceptible to Sclerotinia sclerotiorum, Potential Impact of Cyanobacteria on Crop Plants, Management of the Cyanobacterium Nostoc in Horticultural Nurseries, Care and Maintenance of Wood Shingle and Shake Roofs, Winter Injury of Landscape Plants in the Pacific Northwest, Recognizing Sapsucker Damage on your Trees, Key to Nutrient Deficiencies in Vegetable Crops, Key to Nutrient Deficiencies of Deciduous Fruit and Nuts, Current Status of Biological Weed Control Agents in Idaho, Oregon, and Washington, Biological Control Agents and Their Roles, Restricted-use Herbicides in Idaho, Oregon, and Washington, Testing for and Deactivating Herbicide Residues, Herbicide Effectiveness on Weeds in Grass Seed Crops, Dry Bean East of the Cascades - Phaseolus spp. Life Expectancy of the Kangaroo Paw Flower, Washington State University Clark County Extension, University of Illinois Extension: Common Ninebark, Washington State University Clark County Extension: Pacific Ninebark. This shrub prefers a neutral to slightly acidic soil that drains well, but it will tolerate slightly alkaline soils, as well. It was originally located on the south side of the house next to a retaining wall. Is this enough to control the problem? Trim any overhead branches shading the plant. The colorful foliage emerges in mid-spring, lasting well into fall. Poor soil can be amended with organic material before filling the hole. Prune out one-third of the biggest, oldest shoots right to the ground. Cut out dead, damaged and crossed limbs in early spring. This shrub is tolerant of many climate and soil conditions and rarely requires fertilization. The attractive red stems and exfoliating bark makes this a standout in the winter garden. 32 528 536, Zheng, L., Diamond, J.M. Possible diseases include powdery mildew, fire blight, leaf spot or witches broom. 0 0 Academic Press, San Diego, CA, Zeng, F., Arnao, E., Zhang, G., Olaya, G., Wullschleger, J., Sierotzki, H., Ming, R., Bluhm, B., Bond, J. Use as hedging to break the landscape into individual garden rooms. With different sizes and forms of ninebark to choose from, here are some tips to consider: Choose varieties that will fit the scale of your property. 2017 Control of grape powdery mildew with synthetic, biological and organic fungicides: 2017 field trials. Email: fbaysalg@tnstate.edu. (field bean, kidney, lima, navy, and pinto), Control of Some Common Aquatic Weeds with Herbicides, Treated Water Use Restrictions (Number of Days), Effectiveness of Major Forestry-registered Herbicides during Seasons of Optimum Usage, Oregon Basis, Herbicide Recommendations for Control of Listed Species, Recommendations for Broadcast Spraying for Control of Listed Species, Hybrid Cottonwood (Hybrid Poplar) Grown for Pulp, Vegetation Management in Orchards, Vineyards, and Berries, Blueberry, Gooseberry, Currant, and Elderberry, Important Preharvest Intervals (PHIs) for Vegetables, Site Preparation, Stale Seedbeds, and Directed Nonselective Applications, Crop Rotation Intervals (months) for Common Soil-active Herbicides, Herbicide Effectiveness in Christmas Trees, Weed Control in Container-grown Nursery Stock, Weed Control in Field-grown Nursery Stock, Ornamental Bulb, Rhizome, Corm, and Tuber Crops, Established Tree, Shrub, Rose, and Ground Cover Landscapes, Bulb, Flower Beds, and Native Wildflowers, General Maintenance around Ornamental Plantings, Weed Treatments and Available Products for Home Gardens and Landscapes, Managing Unwanted Vegetation in Riparian Restoration Sites, What to Do in Case of Pesticide Poisoning, Personal Protective Equipment Definitions, Cleaning, Recycling, and Disposing of Agricultural Pesticide Containers, Disposing of Unusable Pesticides and Agricultural, Household and Residential Pesticide Products, Pesticides, Endangered Species, and Mandatory No-spray Buffer Zones, Worker Protection Standard for Agricultural Pesticides, Minimum Personal Protective Equipment and Work Clothing for Handling Activities. , Palmer, C.L., Horst, R.K. & Langhans, R.W. Cultivars are plants produced in cultivation by selective breeding or via vegetative propagation from wild plants identified to have desirable traits. Hear from Jill Koski, President and CEO, why more equitable Illinois urban forests help everyone. May 6, 2023
& Morris, N.S. Ixonia, WI
Whenever possible grow ninebarks and other powdery mildew susceptible plants in full or morning sun. Plant midway in a border in combination with other complementary shrubs, small trees and perennials. Ebert's Greenhouse Village
The white growth seen is composed of both mycelium and fungal spores. Ninebark needs little to no maintenance once established. Divide the mixture into 5-inch pots and sow two seeds per pot at 1/8 inch depth. Since ninebark blooms on old wood, shape as needed just after flowering. Cornell college discovered baking soda helped suppress powdery . Prune lightly as needed to retain its natural shape. Dark green above and paler green beneath. , Assuno, H.H.d., Silva, S.M., Alves, G.S., Zandonadi, C.H. Physocarpus opulifolius. Rebecca Koetter and Michelle Grabowski, Extension educator. In late fall or early winter, cut several pieces of hardwood branch (not softwood tips) from your shrub. May 3, 2023
Growing ninebark in a hot and humid environment makes it susceptible to fungal diseases, like powdery mildew. Plant a smaller variety in a pot and group with other containerized plants with complementary colors for a dynamic contrast. Young twigs are shiny and reddish- brown. This removes future infection. Although powdery mildew is unappealing to the eye it is rarely fatal. Rounded, 5 to 6 feet high and 3 to 4 feet wide; new growth is yellow to orange, changing to lime green. , Herger, G. & Klingauf, F. 1990 Control of powdery mildew fungi with extracts of the giant knotweed, Reynoutria sachalinensis (Polygonaceae) Meded. Consider the type of ninebark you are growing based on your region. 23 Apr. The disease commonly infects several ninebark cultivars throughout their growing range in U.S. Department of Agriculture plant hardiness zones 3 through 7. <, Fungicide control of powdery mildew of cucurbit: 2016 field trial. White/Near White Bloom Characteristics: This plant is attractive to bees, butterflies and/or birds Bloom Size: Unknown - Tell us Bloom Time: Mid Spring Late Spring/Early Summer Other details: Unknown - Tell us Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) Patent Information: Patented Once established, ninebark is a very good drought-tolerant shrub for dry areas. Drooping clusters of reddish fruit (inflated seed capsules) that ripen in July and remain on the plant until they shatter in winter. I have a Center Glow ninebark bush that is going into its second year. Mix well and let cool. Heavy brooming and colonization of leaves can lead to premature defoliation. Reference Lubell, J.D., Brand, M.H. Summer Wine Ninebark (Physocarpus opulifolius 'Seward'): Compact 5 to 6 feet tall shrub with deeply cut wine-red foliage. In spring, these resting structures break open, releasing spores that are spread by the wind. Your current browser may not support copying via this button. Fortunately, powdery mildew is not fatal to the plant but it does affect its appearance. In: O. Carisse (ed.). Ninebark ( Physocarpus opulifolius) is a popular ornamental shrub and considered a hardy and tough plant that can thrive in different environmental conditions and resist diseases. To propagate straight from the mother plant (layering): Ninebark shrub is best propagated from cuttings, however, you can sow seeds collected in the fall. In winter, strips of old bark peel from its naked branches, revealing underbark layers of reddish- or golden-brown. Tiny Wine (Physocarpus opulifolius 'SWPOTWG'): A small, bushy 3 to 4 feet high and wide shrub with fine-textured, deep purple leaves; small clusters of white flowers bloom up and down the . Use as screening, hedging, in a mixed border, or as a focal point. Water the cuttings regularly. Powdery mildew starts off as circular spots of fungal growth that expand in size. They will require a full growing season to develop roots, but in late fall or early spring, your fully rooted cutting will be mature. Our in-stock notifier is the perfect tool for any plant enthusiast who wants to stay informed and be the first to know when by Chris Kaufenberg | Apr 6, 2023 | Market News. C-Value: 8. Brookfield, WI
Grow purple ninebark in areas that offer full sun to partial shade for best growth, advises the University of Illinois Extension. The American Phytopathological Society, St. Paul, MN, Baysal-Gurel, F., Simmons, T., Avin, F.A., Bika, R. & Jennings, C. 2020 First report of powdery mildew on Physocarpus opulifolius caused by Podosphaera physocarpi in Tennessee Plant Dis. Tolerant of wet to dry alkaline soil. This plant is a cultivar of a species that is native to the Chicago Region according to Swink and Wilhelms Plants of the Chicago Region, with updates made according to current research. 2018 Apple disease control and bloom-thinning effects by lime sulfur, regalia, and jms stylet-Oil Plant Health Prog. After a long winter, you can easily see where anybald, bare, or thin patches by Chris Kaufenberg | Apr 25, 2023 | Market News. White to gray, powdery spots, blotches or felt-like mats form on leaves, stems and buds of infected plants. Its fast-growing habit and appealing winter bark make ninebark shrubs garden favorites. Learn how The Morton Arboretum is ensuring the future of trees through leading-edge science and conservation. Deciding when Diabolo looks less than its best is much easier: It's when the Podosphaera aphanis var. Stipes Publishing LLC, Champaign, IL, Dirrs hardy trees and shrubs: An illustrated encyclopedia. The name ninebark hints at the layers of exfoliating bark, but there is little ornamental value in this. Ninebark plants infected by powdery mildew commonly develop superficial patches of white fungal colonies on plant parts. Use as a background plant to set off flowering annuals and perennials. Regents of the University of Minnesota. Address:6885 160th St WApple Valley, MN 55124, Current HoursMON-SAT: 9am to 8pmSUN: 9am to 6pm, Pahls Market 2023 All Rights Reserved | Best in Market, 2023 CSA Enrollment Now Open! The OSU Plant Clinic has detected this disease on eastern ninebark. Remove plant from container and gently tease out roots if potbound. Up to a third of older branches can be removed to improve air circulation. Milwaukee, WI
Compact 5 to 6 feet tall shrub with deeply cut wine-red foliage. https://hort.extension.wisc.edu/articles/powdery-mildew-trees-shrubs/, http://ccenassau.org resources powdery-mildePDF, 9 Bark Bushes - White Powdery Fungus on leaves - Ask Extension. May observe a PGR effect. Apply a fungicide to your ninebark plants to control the disease. Powdery mildew thrives in humid conditions but does not do well if leaves are wet from frequent rain or irrigation. FREE WEEKLY NEWSLETTER: Plants, Design Ideas, Gardening Solutions & More! Ninebark looks best when it is left to maintain its natural growth and shape, however, trimming old wood annually allows for proper air circulation. 1998 Manual of woody landscape plants: Their identification, ornamental characteristics, culture, propagation and uses. Use as hedging, midway in a mixed border, or as a stand-alone specimen. During the growing season, prune only to remove severely infected shoots. Landscape only, not for use on plants for sale. Sci. I have seen powdery mildew on ninebark foliage so densely fuzzy white that the leaves are barely recognizable as leaves. Symptoms include white to grayish leaf blotches and occasional witches' brooms -- bunches of thickened, white- or pink-leaved stems at its branches' ends. Your support is vital to the Arboretum, where the power of trees makes a positive impact on peoples lives. Spring is the ideal time to spruce up your lawn. Apply this spray (making sure to get the undersides of leaves) every 7 to 10 days until the powdery mildew is gone. This mildew-resistant variety benefits from some afternoon shade in hotter climates. Caused by a variety of fungal pathogens, the disease spreads sporadically on wind and may infect other desired plants such as flowers and vegetables. Ninebark tends to bounce back well after pruning. The common name of ninebarkoriginates from the exfoliating bark that peels in layers when plants mature. You may also choose to use a fungicide containing potassium bicarbonate, sulfur or copper. Chemical control Many ornamental labels will support the use if they are not phytotoxic to the plants. Ninebark is generally considered deer-resistant, though some gardeners will experience damage from grazing. Spray liberally, getting top and bottom leaf surfaces and any affected areas. doi: 10.1094/PDIS-06-20-1286-PDN, Blanger, R. & Benyagoub, M. 1997 Challenges and prospects for integrated control of powdery mildews in the greenhouse Can. The Arboretum offers something for everyone in an unforgettable, tree-filled setting. This hardy plant has very few issues, however, it can fall susceptible to leaf curling and wilting with improper care. Mildew has yet to be an issue in our trial; however, 'Chameleon', Diabolo , 'Morning Star', 'Nugget', Summer Wine , and Summer Wine Black May 13, 2023
A good strategy for better management of powdery mildew would be adopting integrated management tools: hygiene nursery practices, using resistant cultivars, proper cultural practices, and rotation of biorational products and chemicals. Colonies of powdery mildew on ninebark can be extensive and cover much of the leaf surface. Infected leaves may be cupped or twisted at the site of the infection. Its not on the entire plant but just one section. Grow as hedging, a foundation planting, or in a container. However, powdery mildew, caused by Podosphaera physocarpi, can severelyaffect ninebark, deteriorating the ornamental value and making them unmarketable. Powdery mildews are favored by warm days and cool nights and moderate temperatures (68 to 86F). Planting requirements for ninebark are similar to any woody landscape shrub. They're most damaging to ninebarks growing in excessive shade, and most active during humid weather with temperatures between 60 and 80 degrees Fahrenheit. Overfertilizing stimulates lots of new, infection-susceptible growth. Photo: Mona Larochelle / Millette Photomedia, Amber Jubilee (syn. Powdery mildew is a common fungal disease of trees and shrubs in Minnesota. Get planting advice, garden design tips and trends, monthly checklists for your area, product specials and more in our weekly newsletter. Avoid fertilizer, especially ones high in nitrogen. Photo: Proven Winners. Clusters of pink or white flowers appear in late spring or summer, giving way to decorative red seedheads. And for sure do this at the end of the growing season after the leaves drop. Ninebark is a popular ornamental shrub that produces clusters of small white or pink flowers followed by color-enhancing papery bark in shades of green, red, purple, and white. In the wild it is found growing along stream banks, rocky ledges and moist thickets. Jugglerguy alpena, mi (zone 4b) might 22, 2007. Gardening in a Changing Climate
Earn Dollar Rewards with Every Purchase, Learn About Upcoming Events and Sales, Member-Only Discounts . Ninebark's native habitat includes stream banks, hillsides, and damp thickets, allowing the plant to grow well in clay and loam soil, as well as shallow and rocky soil. The white fungus growing on your ninebark (Physocarpus opulifolius), appears to be powdery mildew. Photo: Bill Johnson 'Dart's Gold' Place the bundled cuttings in a plastic bag filled with slightly moist sphagnum moss or wood shavings. An easy, fast-growing shrub that introduces dark foliage to the landscape, and the weeping habit adds variety in shape and texture. 150 127 138, Tjosvold, S. & Koike, S.T. Grown for its brilliant golden foliage, Darts Gold pairs well with purple foliaged plants such as Tuxedo weigela or Royal Purple smoke bush for a dramatic contrast in the landscape. One of the smallest varieties, the diminutive stature makes this a good choice for an urban yard. 2016 Fungicide control of powdery mildew of cucurbit: 2016 field trial. Moderately short-lived. Fireblight, a contagious bacterial disease, also can pose a problem. Plant Pathol. Make sure to use a product specifically for shrubs and trees, and one annual feeding is all that is required. The disease can significantly affect the look of ornamental plants like roses and purple-leaved ninebark shrubs. Little Devil (syn. Resistant to powdery mildew. University of California Cooperative Extension, Department of Plant Pathology, Davis, CA. The fungicides and biorational products should be applied by combining or rotating for effective suppression of disease and to avoid the chance of the development of pathogen resistance. Your ninebarks appear to be quite dense with foliage. Fungicides. Use as a hedge, screening, or a dramatic focal point in the landscape. Apply an all-purpose slow-release fertilizer in spring as needed, and mulch around the base with a thin layer of compost or fine bark. Spores spread by wind and start new infections within the plant or in neighboring plants. Entomol. Rake up and remove the fallen and diseased leaves to reduce the odds of re-infection every time the weather favors disease. Ninebark prefers somewhat moist conditions, but is drought-tolerant once established. If you encounter issues loading this site, please refresh the page by using Ctrl + F5 if on Windows or Cmd + Shift + R if on Mac. Put on the protective clothing and gear; it guards against skin, eye and respiratory irritation from the drifting spray. Dismiss. Compact, 5 to 6 feet high; finely-textured, golden yellow to lime green foliage.
