Wholly Mackerel™ is a liquid plant nutrient derived from marine species fish. It is an enzymatically digested product. Bush Doctor® Wholly Mackerel™ provided readily available amounts of organic nitrogen, phosphorous, 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. Easy application No fishy smell Slow release nitrogen Feeds your soil, plants and beneficial soil microbes Boosts early growth Contains essential elements, including calcium, iron, and magnesium Contains vitamins to help plants thrive The proteins in Wholly Mackerel™ are pre-digested into readily usable peptides for plants and soil microbes. Use as a root drench application.