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 components. The specific substances that are responsible for this are phosphorus (enzymes and hereditary characteristics) and potassium (for the transport within the plant).