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 â¦ Common Ninebark, flowers of the cultivar âDiabloâ ... Environmental Damage. 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. Common Ninebark has "perfect flowers," meaning that both male and female parts are contained on a single flower. Add to this that the shrubs are deer, rabbit, and disease resistant, and drought, heat, and humidity tolerant, and youâve got the perfect plant. Physocarpus opulifolius (Common Ninebark) is a fast-growing, upright, spreading, deciduous shrub with an exquisite fountain shape and incredibly decorative exfoliating bark. Wood Rots and Decays (Many genus and species involved) Hardiness Zone: 2 - 6 Mature Height: 5-10 Feet Mature Width: 5-10 Feet Features: Ninebark will thrive with little or no water, and will endure standing in it. 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. Although itâs not particularly susceptible to diseases or pests, however, there is a chance of encountering the following issues when you cultivate ninebark. Ninebark is easy to take care of, and most gardeners donât have to struggle with pests or diseases when theyâre growing a ninebark shrub. It is fast-growing, insect- and disease-resistant, and drought-tolerant. Drought Drowning and Edema Fungal Disease. Common Ninebark Physocarpus opulifolius. 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. Many farmers may be wondering why some plants in their gardens may be having leaves appearing as though they have dark patches. Diseases and pests: Ninebark does not have any significant diseases or pests. Three plants are recommended for a reliable fruiting. Leaf Disease identification:. Ninebark (Physocarpus) is a flowering shrub that should be in almost every northern garden. 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. 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. It's not fussy about soil, either--a little sand to a little clay works fine. A change of weather and the right growing conditions will reduce future problems. The Ninebark is a very versatile and tough shrub which will grow in a variety of site conditions. The male and female flower parts develop in sequence, and the flowers themselves are self-infertile. Therefore, the disease is common in crowded plantings where air circulation is poor and in damp, shaded areas. Provide adequate air circulation by properly spacing â¦ I have seen quite a bit of powdery mildew on ninebark this spring. The weather conditions have been right for this disease to occur. Occasionally powdery mildew can become a problem and some cultivars are bred to have a greater resistance. Propagation: Easily propagated from seed, cuttings, or bare root (4). 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).