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420 Hydroponic Nutrients Big Bud Formula with Protein Vitamins and Other Essentials Plus. 420 Hydroponic Nutrients solution can be used in all Hydroponic Systems as well as Pots and Soil Garden settings. 420 is Brewed from the Finest Grasses surrendering the most complete natural nutrients for your plants. N-P-K addition of 4-2-0 is added to replace essential elements lost during the brew cycle. Some plants require a higher nitrogen ratio during the vegging and early flowering stage. We recommend the Plus of Nitrogen Fixation Microbes.