Growth Science Base A 2.5 gal Here at Growth Science®, we designed our nutrient line to be easy to use yet highly tunable to provide the plants everything they need for phenomenal growth. Growth Science™ incorporates all of the key plant additives and macro/micro nutrients combined into five products so that using 10+ additives is not necessary. This line is perfect for the beginning gardener who wants the maximum yield with a low learning curve as well as being flexible and easily tuned for an advanced gardener. Base A and Base B provide macro and micronutrients needed in all stages of growth. Base A provides nitrogen and micronutrients, while Base B provides the necessary phosphorous and potassium.