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The fungal spores overwinter in plant debris and begin producing new spores in the spring. It is fast-growing and has few, if any, pest problems. Powdery mildew needs humid conditions to start new infections. Ninebark is an easy-to-care-for shrub with minimal pruning and feeding needs. Enjoy Life Symposium They're most damaging to ninebarks growing in excessive shade, and most active during humid weather with temperatures between 60 and 80 degrees Fahrenheit. Cornell University found baking soda helped suppress powdery mildew. Soc. For exceptional toughness, easy maintenance and four-season interest, few ornamentals can rival the appeal of ninebark. Upright, 8 to 10 feet high, dark purple leaves, pinkish-white flower clusters in early to mid summer. & Gubler, W.D. How Do You Treat Powdery Mildew On Plants Ninebark? 3 Exclusive Tips! Use as a background plant to set off flowering annuals and perennials. All you have to do is combine one tablespoon with one-half teaspoon of liquid soap and a gallon of water. is an extremely versatile plant. Regents of the University of Minnesota. Growing ninebark in a hot and humid environment makes it susceptible to fungal diseases, like powdery mildew. Mention of trade names of commercial products in the publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by Tennessee State University. Not for nursery or greenhouse use. How to Grow and Care for Ninebark Shrub - The Spruce Features. Provide mulch around the base annually to help the plant retain moisture and to prevent weeds. Purple ninebark is a cultivar of common ninebark (Physocarpus opulifolius), also referred to as Eastern ninebark. physocarpi fungus, or powdery mildew, strikes. 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. Foliage of cultivars varies in size and color from purple to lime green. Photo: Rock Gigure / Millette Photomedia. Ninebark prefers moderately moist, well-draining soil with a pH that is neutral to slightly acidic. Fall color is generally insignificant. Trim any overhead branches shading the plant. Easy, durable summer color! Whenever possible grow ninebarks and other powdery mildew susceptible plants in full or morning sun.