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For several years, and this spring too, I have tried to grow gerbera daisies in containers. I purchase them from reputable sources. However, they end up with powdery mildew every time. What am I not doing wrong? They get plenty of water, but do not sit in it. They get shade during the mid-afternoon, but what I think is enough sun. They are out on a patio, so they get plenty of circulating air. Does anyone know what may be the problem? What do I put on them to stop the mildew?
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