Cow Wow Liquid Compost Cow Wow is made from nature's finest fertilizer - dairy cow manure. One quart of this nutrient-packed concentrate covers the equivalent of up to 10 bags of dry compost. 1 Ounce makes 1 Gallon of Plant Food Cow Wow. Can be used as a foliar spray or soil treatment. Safe for all plants, vegetables, trees, lawns and soil.