Basis A&B is a two part Base nutrient compatible with all mediums and growing systems. This page is for Part A - Find Part B at this link here Basis Part B Not all base nutrients are created equal. Made from top-quality ingredients with a focus on bioavailability, Mills Basis A&B has all the macro and micronutrients your plants need, carefully balanced to insure proper nutrition in both vegetative and bloom stages. With everything in the right proportions, it makes it easier for growers of all skill levels. Novice growers can simply use as directed, confident that their plants are receiving a balanced diet; advanced growers can save precious time not having to identify and address specific nutrient deficiencies one at a time. Tested thoroughly in soil, coco, and hydro, Basis A&B is a solid foundation for your plants to grow on.