CANNA PK 13/14 is a dynamic concentrate for the last phase of flowering that actually increases the size of the tops. PK 13/14 is a high quality mixture of phosphorus and potassium that is added during the flowering phase. Both elements play a big role during the flowering phase of cannabis plants. Thanks to a special production process CANNA has succeeded in combining the purest phosphorous and potassium in very high concentrations and this makes PK 13/14 available to the plants quickly and immediately. PK 13/14 is used with every medium and is consequently used for cultivation in soil, with recirculation systems, when cultivating on coco and in run-to-waste systems. 13% P and 14% P in the trusted PK13/14 !!