Increases yields CANNA PK 13-14 is a mixture of top quality nutritional minerals that stimulate flowering. This product has been developed for the flowering phase of fast growing plants. PK 13-14 is easy to use and high yields are easily achieved. Pure elements to stimulate flowering 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.