Top Booster is the REAL PK 13/14 for serious floral production! Using premium mineral phosphorus and potassium (plus added EDDHA – FE Iron) to encourage the plant into a final stage of reproductive growth. Top booster encourages autumn hormones (ethylene) to reinforce the plants biological response to a changing light environment. Top Booster PK 13/14 is generally only used for 1 week in the middle of the reproductive stage. With this floral trigger and reinforcement of the flowering process, the plant will form larger flowers and fruits and encourage faster, higher quality yields.