Gravity 0-2-0 Our uniquely prepared kelp extract and phosphorus based additive will harden your flowers from the top to the bottom. A little goes a long way. Use once or twice about 3 weeks before the end of a plants cycle. Adds size and weight to flowering plants. Soil and hydroponic gardeners alike can use Gravity to increase the mass and weight of their favorite fruits, vegetables and flowers. Gravity includes 0.75% kelp extract and 0.01% vitamin B1 and is compatible with most popular nutrient programs. Concentrated formula requires only one or two treatments late in the bloom cycle.