How to Use Liquid Fish Fertilizer


Liquid fish fertilizer is available in garden centers and online, and it comes in various types for different applications. Some liquid fish fertilizer is blended with kelp, some is processed from specific fish (for example salmon), and some is made to be applied only as a foliar spray. Manufacturers include plenty of information on their products to help you select the correct liquid fish fertilizer and to use the correct dilution ratio for your needs.

Feeding Your Plants

Step 1

Spray lawns with a solution of 3 tablespoons liquid fish fertilizer per gallon of water. This provides plenty of nitrogen to support good grass blade growth. In a lawn watering system, use liquid fish fertilizer at 1/2 gallon per 1,000 square feet of lawn. Apply fertilizer to lawns every four weeks during the growing season, beginning when grass greens up in the spring.

Step 2

Stand cuttings for rooting or transplanting in a mixture of 3 tablespoons liquid fish fertilizer per gallon of water. Leave them overnight in the solution for a boost before transplanting. After transplanting, water the transplants with the remaining mixture.

Step 3

Mix 3 tablespoons liquid fish fertilizer per gallon of water for foliar feeding. Spray it on the leaves and stems of the plants once every two weeks. Some companies sell a diluted foliar feed, so check the package to see if dilution is necessary. Foliar feeding may be used on any garden plant or houseplant. Use early in the day so the leaves will dry before evening, and avoid spraying during the hottest part of the day.

Step 4

Use a dilution rate of three tablespoons liquid fish fertilizer per gallon of water in drip irrigation systems in your garden for general watering and feeding of all plants. The same dilution is used for direct soil watering if you use a watering can.

Step 5

Apply a blend of liquid fish fertilizer and kelp fertilizer, for garden plants that need strong stems. This blend encourages leaf growth while strengthening stems and aiding in fruit set. Tomatoes and peppers are examples of plants that benefit from this blend.

Step 6

Improve the nutrient content of your compost pile, and help speed decomposition. Spray your compost pile with 3 tablespoons liquid fish fertilizer per gallon of water to moisten the pile, and the nutrients will be retained in your finished compost.

Tips and Warnings

  • Do not to use salmon-based foliar fertilizer in areas where bears live. Do not use kelp blends on plants with edible stems, such as broccoli, kale, lettuce or spinach. It can cause the plants to develop stringy stems.

Things You'll Need

  • Liquid Fish Fertilizer
  • Water
  • Liquid measuring devices
  • Watering system or sprayer


  • Liquid Organic Fertilizer Information
  • Maxicrop Liquid Fish Fertilizer
  • Home Harvest Garden Supply: Fish Fertilizers

Who Can Help

  • Liquid Fish Organic Fertilizer Information
Keywords: how to use fish fertilizer, using liquid fish fertilizer, diluting liquid fish fertilizer

About this Author

Fern Fischer is a freelance writer with more than 35 years' experience. Her work has been published in various print and online publications. She specializes in organic gardening, health, rural lifestyle, home and family articles. Fischer also writes about quilting and sewing, and she professionally restores antique quilts to preserve these historical pieces of women's art.