FloraDuo B by General Hydroponics is part B of a revolutionary two part fertilizer. FloraDuo can help horticultural professionals or garden hobbyists provide plants with essential nutrients needed for all phases of plant growth. FloraDuo contains Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sulfate and micronutrients. Using only two components, you can mix a large range of different nutrient blends for different kinds of plants! Great for diverse greenhouses and horticultural systems. Listing for Flora Duo B Only. Quantity: 2.5 Gallon.