RAW YUCCA: surfactant RAW Yucca is made from 100% natural yucca extract from the plant Yucca Schidigera. It can be used as wetting agent for nutrient solutions and foliar sprays and is great for flushing excess salts from the root Zone. When used on soils, it helps water and nutrients penetrate deeper and more evenly into the root zone. We recommend adding a pinch (1/16 tsp per 5 gallons) RAW Yucca to all foliar, nutrient and flush solutions. Works in conjunction with all nutrient and feeding programs.