PK Boost is a bloom booster consisting of phosphorous and potassium, and enriched with EDDHA-Fe. This combination is indispensable during the flowering stage, stimulating the development of large flowers and fruits. PK Boost does not contain bulking agents, and is suitable for all irrigation systems. Not to be used in combination with other PK fertilizers. Available in 250 ml, 1, 5 and 10L.