Spray the plants with a fungicide when young tips break through the ground. We’ve had some luck in swiftly yanking such stems up and off the root. If you’d like to learn more about peonies, opportunities abound on the web. Use a fungicide. Plant herbaceous peony roots 1/2” deep, presuming the uppermost eyes will not sink below 2” in loose, freshly cultivated soil. Powdery Mildew? If the soil’s too sandy, add amendments, such as fresh soil and compost. Should it be reapplied and if so, how often? Spray the plants with a fungicide when young tips break through the ground. Mixing up such sprays carelessly and adding too much surfactant can sometimes cause more damage than the botyritis. It can burn or cause damage to the plant when temperatures are warm/hot. The peonies and tree peonies you'll want Ask an Expert is made up of groups and individual experts. Use fertilizer in moderation, strictly according to directions. Fungicides can be used to prevent the disease in peonies. Or find a retailer in your area. (Even then, in the cool springs and summers of Western WA, there just isn’t enough heat consistently to rapidly and thoroughly compost manure atop the soil or even well worked into it, so beware!) Generally, these fungicides come with mancozeb and thiophanate methyl (Cleary 3336). Botrytis can also be minimized and controlled even if your plants get a touch of it. There are tons of plant foods out there that somebody would like to sell you. Printer Friendly Version This article was last updated on 09/28/20 Botrytis is a fungus that affects peonies, especially in a rainy year. If only the tip of a leaf is affected, however, only remove the tip, not the whole leaf. Additional fungicides may registered for use on different plant(s) or groups of plants so always make sure the plant which will be treated is also listed on the label of the product purchased. Fungicides must be applied in advance of the disease as a protectant. Discover (and save!) Spray the plants with a fungicide when young tips break through the ground. Pesticides registered for use include copper, captan, chlorothalonil (Daconil), mancozeb, maneb, sulfur, and thiophanate methyl (Cleary 3336). To really solve the problem, however, (and avoid this kind of violence to your plant) as soon as you can tell your tree peony has grown some of its own roots, dig it up in fall and cut off all the root below the original graft. Plant roots as soon as you get them. For best results start your spray program when stems are up 5 or 6 inches then continue spraying once every week to 10 days until bloom time. In fall the leaves of your peony will pale as the plant enters dormancy. Apply early in spring no more than once a year. In this case, more is not better. Follow the recommended temperature and weather limits during the application. Peonies are a long-time favorite, cherished for their large, fragrant blooms which can reward their growers with decades of beauty. Add three heaping handfuls to each hole and work well into soil before planting the peony root. The Fungicide Resistance Action Committee (FRAC) has assigned alphanumeric codes to fungicides based upon the modes of action of the active ingredients. Start off in the right place—in full sun; in good, loose, friable soil; and preferably in a raised bed. Botrytis is an airborne fungus that can affect peonies growing any where and can especially be a problem in prolonged wet, cool weather, such as we might have here in the Pacific Northwest. Clay soil should be amended with sand and compost and formed into a raised bed to facilitate drainage. Powdery mildew is the bane of all gardeners. If sucker roots are left to grow for any length of time, they will diminish your tree peony or worse. State, fungicides registered to help manage Botrytis blight of peony include some formulations of copper or the QST 713 strain of Bacillus subtilis, and some Neem oil products. Botrytis blight is a fungal disease that is caused by wet spring and summer weather. In cold winter areas, all first year peonies should be mulched with clean hay, straw or pine boughs after the first freeze to prevent the ground from heaving. Raised beds are best. Treatment of leaf blotch includes removal of infected parts, application of appropriate fungicide and watering only at the base of the plant. From planting to staking, it is important to familiarize yourself with potential issues to keep your peonies looking healthy and vibrant. It rarely harms the root itself, unless left untreated for years. Three years to bloom profusely in the garden, preferably used before blooms.... S so potent sanitation practices, such as fresh soil and compost to 14-14-14 will do and.. Will take about three years to bloom profusely should it be reapplied and if so how! Botrytis blight add amendments, such as fresh soil and compost you won ’ t the. 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