Add to this that the shrubs are deer, rabbit, and disease resistant, and drought, heat, and humidity tolerant, and you’ve got the perfect plant. Ninebark is easy to take care of, and most gardeners don’t have to struggle with pests or diseases when they’re growing a ninebark shrub. Incidence of infection increases as relative humidity rises to 90 percent, but it does not occur when leaf surfaces are wet (e.g., in a rain shower). Three plants are recommended for a reliable fruiting. The weather conditions have been right for this disease to occur. Profuse creamy-white flowers, delicately pink-tinged, appear in dense, rounded clusters in late spring before they give way to drooping clusters of red fruit in fall. It is fast-growing, insect- and disease-resistant, and drought-tolerant. There is an easy way of identifying this kind of common plant disease by looking for small and dark spots that are raised occurring on leaves of plants. Common Ninebark, flowers of the cultivar ‘Diablo’ ... Environmental Damage. Ninebark will thrive with little or no water, and will endure standing in it. A native to Minnesota and hardy as far north as USDA Zone 2, common ninebark (Physocarpus opulifolius) grows up to 10 feet tall with green to greenish yellow leaves. Diseases and pests: Ninebark does not have any significant diseases or pests. We embody the University's land-grant mission with a commitment to eliminate hunger, preserve our natural resources, improve quality of life, and empower the … Although it’s not particularly susceptible to diseases or pests, however, there is a chance of encountering the following issues when you cultivate ninebark. Young, succulent growth usually is more susceptible than older plant tissues. Physocarpus opulifolius, known as common ninebark, Eastern ninebark, Atlantic ninebark, or simply ninebark, is a species of flowering plant in the rose family Rosaceae, native to eastern North America. Propagation: Easily propagated from seed, cuttings, or bare root (4). Common Ninebark Physocarpus opulifolius. Wood Rots and Decays (Many genus and species involved) Hardiness Zone: 2 - 6 Mature Height: 5-10 Feet Mature Width: 5-10 Feet Features: Occasionally powdery mildew can become a problem and some cultivars are bred to have a greater resistance. While adaptable to a wide variety of soils and mositure levels, the Ninebark is most at home along the edges of wetlands or stream banks. Drought Drowning and Edema Fungal Disease. Common Ninebark has "perfect flowers," meaning that both male and female parts are contained on a single flower. The male and female flower parts develop in sequence, and the flowers themselves are self-infertile. A change of weather and the right growing conditions will reduce future problems. It's not fussy about soil, either--a little sand to a little clay works fine. 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