High humidity is generally the cause of Powdery Mildew. So anything you can do to reduce the humidity, such as a dehumidifier would definitely be a big help. Then you should start burning some sulphur. You can buy a sulfur burner for about $100, or so. If you want to do it more danerously, buy yourself a hot plate and a pot or skillet, and burn your suphur in the pot or pan. Be careful not to burn it too long or too hot, because it will burn your plants.

Those are the basic things you need to do to get rid of PM>


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