Young, succulent growth usually is more susceptible than older plant tissues. Many farmers may be wondering why some plants in their gardens may be having leaves appearing as though they have dark patches. It's not fussy about soil, either--a little sand to a little clay works fine. 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. Wood Rots and Decays (Many genus and species involved) Hardiness Zone: 2 - 6 Mature Height: 5-10 Feet Mature Width: 5-10 Feet Features: 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 … 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. Three plants are recommended for a reliable fruiting. 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. Although it’s not particularly susceptible to diseases or pests, however, there is a chance of encountering the following issues when you cultivate ninebark. Ninebark (Physocarpus) is a flowering shrub that should be in almost every northern garden. Provide adequate air circulation by properly spacing … Leaf Disease identification:. The male and female flower parts develop in sequence, and the flowers themselves are self-infertile. 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. Diseases and pests: Ninebark does not have any significant diseases or pests. I have seen quite a bit of powdery mildew on ninebark this spring. Occasionally powdery mildew can become a problem and some cultivars are bred to have a greater resistance. The Ninebark is a very versatile and tough shrub which will grow in a variety of site conditions. Common Ninebark Physocarpus opulifolius. 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). Common Ninebark has "perfect flowers," meaning that both male and female parts are contained on a single flower. 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. Therefore, the disease is common in crowded plantings where air circulation is poor and in damp, shaded areas. Ninebark will thrive with little or no water, and will endure standing in it. It is fast-growing, insect- and disease-resistant, and drought-tolerant. Propagation: Easily propagated from seed, cuttings, or bare root (4). 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