PK 13/14 is a high grade mixture of phosphorus and potassium that is added during the flowering phase. Both elements play a big role during the flowering phase of fast growing plants. Thanks to a special production process CANNA has succeeded in combining pure phosphorous and potassium in very high concentrations and this makes PK 13/14 available to the plant quickly and directly. PK 13/14 is used with every medium and consequently it is used for cultivation on soil, in recirculatory systems, when cultivating on coco and in run-to-waste systems. PK 13/14 is suitable for use when cultivating both indoors and outdoors. When Canna began sales in North America, PK 13/14 used the standard European way of expressing percentages of the nutrients in fertilizer as volume/ volume (milliliters/ liter). It was after arriving on the shelf in NA that we had to change to the North American convention of using Mass/ mass (milligrams/ kilograms). So, to satisfy the regulatory powers, we are required to state the mass percentages of the contents of PK thus the additional numbers 0 - 10 - 11. Same fine product, just a different way of stating the percentages of the nutrients as 0 - 10 - 11 in mass percentages is exactly the same as 0 - 13 - 14 in volume percentages.