Wholly Mackerel is a liquid plant nutrient derived from marine fish species. It is an enzymatically digested product. Wholly Mackerel provides readily available amounts of organic nitrogen, phosphorus and potassium to growing plants. Our extra strength fish fertilizer contains 20 different amino acids, 13 vitamins and 8 minerals including manganese, iron, copper and zinc. These nutrients are also available to plants when applied as a foliar spray. The proteins in Wholly Mackerel are pre-digested into readily usable peptides for plants and soil microbes. Use as a root drench application.