Bee balm with powdery mildew

Photo By Julie Martens Forney

Powdery Mildew on Bee Balm

Powdery mildew makes garden plants unsightly, and it limits a plant’s ability to nourish itself and flower or produce fruit. Plants like bee balm, roses, squash and cosmos are often infected with powdery mildew. Easy Solution: Spray plants with a home brew fungicide—you can find many recipes online. A favorite is 1 tablespoon baking soda and 2.5 tablespoons horticultural oil in 1 gallon of water. Spray plants weekly to protect new growth.