For flowering, combine this General Hydroponics GH1682 FloraDuo part B with FloraDuo part A (sold separately). This new nutrient is complete, balanced, and very simple. And like all of General Hydroponics formulas, it is highly concentrated and cost effective. FloraDuo makes all the essential macro and micro nutrients available to your garden and also provides plants with specific ingredients to help resist pathogens and insects. It is designed for all growing methods including hydroponics, soil, and coco blends.