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What about using a diatenacious earth or hydrogen peroxide mixture? Will they damage the flowers just as much?

Thanks for all the feed back. You are all awesome. I'll plan to monitor them closely for the final weeks of flowering and use a potassium bicarbonate solution if needed. How often should I apply that type of solution to control powdery mildew? Also could I use Neem oil on the ground cover...

I began noticing powdery mildew on my outdoor plants in the second week of flowering. I have treated the plants twice with Neem oil and it seems to have worked well in controlling it. After reading other posts will my flowers be ruined? Or can I do anything to lessen the as affect of the oil on...