Hammerhead contains ratios of phosphorus(P) and potassium(K) found to produce larger yields in flowering and fruiting plants.  It contains the highest quality P and K for maximum absorption that results in heavier harvests.  Use one week after beginning of the bloom cycle, and continue using until one week before harvest.  

N-P-K levels:  Nitrogen(N) 0.0%, Phosphorus(P) 9.0%, Potassium(K) 18.0%