Mold on the Leaves of my Phlox
The "mold" growing on your garden phlox is a fungus called powdery mildew. Some varieties are quite susceptible to it and others are very resistant. If yours is severely affected by the fungus, you may want to consider replacing it with a disease-resistant type. Spraying with horticultural oil can provide some protection from the disease, but this likely will need to be done every year as long as you keep this plant.
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