Reach the full genetic potential of your crops with Emerald harvest Cali PRO grow a & B & Cali PRO bloom a & B, our complete 2-part base nutrient series. Cali PRO is a nitrogen-rich fertilizer that nourishes your high-yield, indoor-grown crops with the essential elements they need to develop strong stalks & stems & support a robust harvest. Rich in phosphorus, potassium & other essential plant nutrients needed for vigorous fruiting & flowering, Cali PRO also contains trace elements such as chelated iron, cobalt, manganese & Zinc. Use Cali PRO bloom a & B during flowering.