HESI - PK 13/14 - 20LHESI PK 13 14 HESI PK 13 14 for flowering intensification. Plants have an increased need for phosphorus as well as potassium in the flowering phase, by applying HESI PK 13 14 we completely fulfill this need.. The flowering period is the culminating point in the life of a plant. The metabolism is then working at full power and large quantities of enzymes are being produced for flowering. Furthermore, the plant gets bigger and therefore needs more