Dyna-Gro Mag-Pro 2-15-4 1 GalMag Pro 2 15 4 is a supplement high in phosphorus, magnesium and sulfur. This unique plant supplement can be used with any complete nutrition formula as a blossom booster to help initiate flowering and develop large, vibrant, fragrant flowers. The nutrients in Mag Pro are immediately available, giving your plant the ability to access the nutrients they need at the critical times of flower formation to ensure massive growth and enhanced aromas. Growers