Humboldt Nutrients Master A is the highly concentrated Nitrogen, Potassium/Calcium and micro nutrients containing formula for use primarily in the growing phase when used in conjunction with Master B. For use in any growing medium.

Humboldt Nutrients Master B is the highly concentrated Phosphorus, Potassium and Magnesium containing formula for use primarily in the flowering phase when used in conjunction with Master A. For use in any growing medium.

Humboldt Nutrients has formulated this vigorous 2-part nutrient solution for use on any plant, in any growing medium and contains no EDTA’s.

The Humboldt Nutrients team of chemists and agronomists emphasize balance and consistency with all our formulas. Master A and Master B are formulated to provide your favorite plants with higher absorption of nutrients, vitamins, minerals and trace elements.

The Master A and Master B series stands apart from your standard base nutrient line by making macro and micro nutrients more available to your plant.

Used in conjunction with Humboldt Nutrients’ powerful additives we assure that your yields and quality will increase so dramatically that your friends will call you, simply, “The Master.”