GreenCure is a potassium bicarbonate-based fungicide used to control
powdery mildew, black spot and other common plant diseases. It’s
recommended as a foliar treatment for more than 85 different plant
varieties including vegetables, trees, ornamentals and houseplants, and
one tablespoon of powdered GreenCure added to one gallon of water will
cover approximately 450 square feet. GreenCure is also registered "for
organic production" by the USDA's National Organic Program (NOP).