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I have a 20' x 5' shady raised border against a 6' solid privacy fence. Currently the dominant shrubs are deciduous azaleas. There are two Northern Lights ( pink) and one 'Cannon's Double'. Planted in between are a mix of hostas and Dicentra. It's gorgeous in the spring but the rest of the year I have a huge problem with powdery mildew on the Northern Lights. The shade coupled with poor air circulation from the solid fence combine to make perfect conditions for the development for of powdery mildew. Spraying every 7-10 days starting at bud break will keep it at bay. I tried the Bayer Advanced soil drench this rear and found that product to be less effective than advertised in spite of careful measuring and applying every 4 weeks. Are there any hardy ( zone 5), flowering shrubs not susceptible to powdery mildew? The soil is pH 6.8, sandy and well drained. Positioning is medium shade ( under high oaks ). The shade disappears in the winter when the oaks drop their leaves.
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