GreenCure is a potassium bicarbonate-based fungicide used to control
powdery mildew, black spot and other common plant diseases. GreenCure
is recommended as a foliar treatment for more than 85 different plant
varieties including vegetables, trees, ornamentals and houseplants. One
tablespoon of powdered GreenCure 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).