Grow Big® Hydroponic (3-2-6) is a potent, fast-acting, complete fertilizer specially formulated for use in hydroponic growing systems, encouraging vigorous vegetative growth. Containing earthworm castings and Norwegian kelp, this special brew encourages sturdier, healthier stems and leaves, while also providing enough nutrients and trace minerals to create the kind of healthy branching later in the season for more abundant buds and blooms.