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Never use sulfur on plants that have neem on them or , never use neem on plants that have sulfur on them . It will burn your plants . My advice is to burn sulfur if plants are not in flower
If he had powdery mildew, it certainly wasn’t a very bad infection and I couldn’t even see it although the pictures were pretty poor, there’s a very good solution, but you have to maintain and integrate as part of your maintenance regular spraying https://www.lostcoastplanttherapy.com/