humboldts secret base a & b bundle – world's best base nutrient system – liquid nutrient/fertilizer for indoor plants – supports vegetative and flowering stages of plants – set of quarts humboldts secret humboldts secret base a & b bundle is the world’s best base nutrient system, as it contains a premium signature blend of nitrogen, phosphorus, potassium, calcium, magnesium, fulvic acid, and other essential macronutrients. the combination of base a & b ensures a complete feed for rapidly growing flowering plants. our commercial-grade and garden-safe two-part base nutrient system should be used from the beginning of vegetative growth through the end of the flowering cycle. humboldts secret grow & bloom is perfectly suited for all growing mediums, including potting soil for indoor plants, hydroponics, coco, and soil cultivation. no more second-guessing! our 2-part base nutrient system is safe and easy to use. we recommend using base a and base b in equal parts at a rate between 5-14 ml/gallon for optimal results. you’ll be happy to know that our product is not only suitable for garden plants, but for indoor plants as well! although our base a & b nutrient system will provide all of the essential nutrients for growth and increased plant production, for maximum results, you can use it with our signature golden tree product.