Fox Farm has adapted their popular liquid plant food, Grow Big®, for hydroponic systems. This is a potent formula that will encourage healthier, sturdier stems and leaves, and overall, encourages vigorous vegetative growth from the first week through bud set. Fox Farm has also added earthworm castings and Norwegian kelp into this special brew along with enough nutrients and trace minerals to create the kind of healthy branching. You will see fast acting results with this hydroponic formula. Quantity: 2.5 Gallons.