Comparison: Best Fish Fertilizer For Grass (Updated | Dec 1st)
If you’re looking to give your lawn a natural boost, you’ve probably heard about fish fertilizer—but with so many options out there, which one really delivers? Whether you’re a seasoned gardener or just starting out, choosing the right fish fertilizer can make all the difference. Let’s break down the top contenders so you can grow greener, healthier grass the organic way.
- Best for omri certified: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin-rich blend: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for fish & kelp boost: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for wintergreen fresh: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for high-nitrogen lawn: Superior 15-0-15 Liquid Lawn Fertilizer – Lawn Food for Growth & Green – Nitrogen
- Best for seaweed garden boost: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for odorless fish: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for sustainable fish emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for balanced 16-4-8: Advanced 16-4-8 Lawn Fertilizer – Liquid Lawn Food Spring & Summer Concentrated Spray – Any Grass Type- Fish and Seaweed Kelp- Balanced NPK – Simple Lawn Solutions (1 Quart)
- Best for deep green formula: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
Product Comparison: Best Fish Fertilizer For Grass
Alaska Fish Fertilizer OMRI Listed 5-1-1, 115 oz
- Fish-based fertilizer for use in vegetable, fruit, and flower gardens
- Excellent for use on flowers, trees, and other plants
- OMRI listed
- For organic gardening
- Great for all indoor and outdoor plants
- NPK 5-1-1 fish emulsion fertilizer
- Fish has been used as a natural source of plant nutrients for centuries
- Easy to use, just mix with water
CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer, 1 Quart
- Promotes healthy plant growth with 11 vitamins
- Can be used on all indoor and outdoor plants
- 100-percent organic
- Stimulates microorganisms
- Does not burn
GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens, Lawns, and Vegetables
- ORGANIC MATERIALS REVIEW INSTITUTE LISTED FOR TRUSTED GARDEN CARE Certified by OMRI for use in organic growing, GS Plant Foods Liquid Fish & Kelp Fertilizer delivers reliable, natural nutrition for vegetables, lawns, flowers, and shrubs.
- SEA-AND-SOIL BASED NUTRITION Made from North Atlantic seaweed (Ascophyllum nodosum) and fresh fish hydrolysate, this liquid concentrate provides essential nutrients and trace minerals that help support healthy soil and plant development.
- IMPROVES SOIL MICROBIOLOGY & NUTRIENT UPTAKE Supports a thriving soil ecosystem that promotes strong root systems and efficient nutrient absorption — the foundation for resilient, productive plants.
- EASY-TO-USE CONCENTRATE FOR ALL PLANTS Mix 2 oz per gallon of water and apply as a foliar spray or soil drench every 2–4 weeks. Safe for use on vegetables, fruits, ornamentals, turf, and houseplants.
- MADE IN THE USA – SUSTAINABLY PRODUCED Proudly produced by GS Plant Foods as a licensed fertilizer manufacturer. No synthetic chemicals, additives, or fillers — just natural ingredients formulated for healthy home gardens and hobby farms.
Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Will Not Burn
- Great for all plants
- Deodorized with Natural Wintergreen
- 5-1-1 fertilizer is an excellent source of organic plant nutrients
- Fish Fertilizer
Superior 15-0-15 Liquid Lawn Fertilizer – Lawn Food for Growth & Green – Nitrogen, Potassium, Humic, Fish & Seaweed – Any Grass Type- Simple Lawn Solutions – All Season- Attached Sprayer (32 Ounce)
- 15-0-15 Lawn Fertilizer To Promote Greening, Growth And Turf Hardiness: The Power Of Nitrogen & Potassium Blended With Humic, Fish And Seaweed. Intensify Green And Growth While Providing Key Nutrients For Turf Hardiness.
- Can Be Used On All Grass Types: Lawn Fertilizer For Bermuda Grass, St. Augustine Grass, Zoysia Grass, Tall Fescue, Fine Fescue & Kentucky Bluegrass.
- Liquid Lawn Fertilizer: 15-0-15 Nutrient Ratio Provides Balanced Nutrients For Overall Lawn Vigor. Liquid Fertilizer For Spring, Summer And Fall.
- Nitrogen Lawn Fertilizer: Nitrogen Encourages Vigorous Growth For The Development Of A Dense Green Attractive Lawn. Nitrogen Is The Most Essential Macronutrient For Turf.
- Potassium Fertilizer For Lawns: Potassium Can Enhance The Plant’s Endurance To Stress If A Deficiency Is Present. This Concentrated Liquid Fertilizer Provides Essential Nutrients.
- 15-0-15 Fertilizer Blended With Humic, Fish And Kelp: Our Humic Is Derived From The Highest Quality Humate Source, Leonardite. Our Ascophyllum Nodosum Seaweed Harvested In The Icy North Atlantic.
- Attached Easy To Use Sprayer: 15-0-15 Liquid Lawn Food Comes With An Attached Ready To Use Sprayer. Hook To Your Hose To Apply. Covers 3,200 Square Feet.
- Use Alongside Fertilizer Program. 15-0-15 Liquid Fertilizer Can Be Used With Your Current Fertilizer Program For A Quick Nutrient Uptake.
- Produced In The United States: 15-0-15 Is Manufactured In The United States Of America, By A Family Owned Business With Over 25 Years Of Former Experience In The Commercial Professional Turf Industry.
Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1, 18 Ounce
- Grow a beautiful vegetable garden
- Flowers and foliage will be stronger and more colorful
- Blooms will be more plentiful, fragrant and longer lasting
- Easy to mix and apply by hand, sprayer, or drip line
Neptune’s Harvest Fish Fertilizer 2-4-1, 18 Ounce
- Neptune’s Harvest is an organic fertilizer made from fresh north Atlantic fish
- It is made by a unique cold process that protects the vitamins, amino acids, enzymes and growth hormones
- It also contains all the micro and macro nutrients naturally found in fish
- Unlike fish emulsions, Neptune’s Harvest retains the fish proteins and oils and has no unpleasant odor
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants, Flowers, Fruits & Vegetables, 2-3-1 NPK – Sustainably Sourced and Hydrolyzed for Steady Growth
- ORGANIC FISH EMULSION FERTILIZER – Our liquid fish fertilizer is made from sustainably sourced fish emulsion and we use up all the parts that would otherwise go to waste. Using an environmentally conscious method, ingredients are refined fresh and 100% cold pressed to help retain all of the nutrients, vitamins, and amino acids needed to grow healthy plants.
- GROW PLANTS NATURALLY – This wonderfully organic alternative to synthetic fertilizer contains a 2-3-1 NPK ratio perfect for light and frequent applications. Promotes steady, healthy plant development throughout the growing season.
- ENRICHES SOIL – Helps build a strong foundation for your organic garden to thrive on! Use as an effective soil drench to improve fertility, structure, and encourage the growth of beneficial microorganisms like fungi in your garden’s soil.
- PRODUCE MORE – Get the most out of your fertilizer and your garden! This organic garden fertilizer helps to increase crop yields and flower blooms. Gentle enough to use as a foliar spray makes this the perfect fish fertilizer for plants, flowers, and vegetables.
- SMELL THE DIFFERENCE – This fertilizer smells like fish because it’s made from fish! Crafted with high-quality concentrated and undiluted hydrolyzed fish emulsion each bottle gives off a pungent fishy aroma. When compared, we see it like this – if it doesn’t smell, then it’s not real fish!
Advanced 16-4-8 Lawn Fertilizer – Liquid Lawn Food Spring & Summer Concentrated Spray – Any Grass Type- Fish and Seaweed Kelp- Balanced NPK – Simple Lawn Solutions (1 Quart)
- 16-4-8 Liquid Lawn Food Fertilizer: The perfect blend of key macronutrients. This lawn liquid food turf fertilizer also contains Seaweed & Fish
- This complete Nitrogen, Phosphate, and Potash formula gives your grass greening & growth while providing nutrients for lush lawns. Apply 16-4-8 Liquid Fertilizer using a hose end sprayer, backpack sprayer, pump up sprayer or watering can
- Blended with 16% Nitrogen. Nitrogen is a major component of chlorophyll, where lawns get their green coloring. Nitrogen encourages growth for the development of a dense attractive lawn
- Blended with 4% Phosphorus. Phosphorus encourages root development and enhances lawn establishment in early stages
- Blended with 8% Potassium. Potassium can enhance a lawn’s endurance to temperatures and drought if a deficiency is present
- Contains Seaweed and Fish. Seaweed & Fish Emulsion provides rich nutrients to soil for a more effective Lawn Food and optimum nutrient uptake
- Application Rates for Lawn, Garden and Indoor Plants: Versatile Formula can be used on turf grass, ornamentals, young plants, flower beds, potting soil, young trees, garden and hardy plants
- All Grass types: Including Bermuda, St. Augustine, Zoysia, Buffalo, Centipede, Florida Palmetto, Bahia, Fescue, Ryegrass & Kentucky Bluegrass
- Produced In The United States: 16-4-8 is manufactured in the United States of America, by a family-owned business with over 25 years of former experience in the commercial professional turf industry
- Use Alongside Fertilizer Program. 16-4-8 Liquid Fertilizer can be used with your current fertilizer program. Great as a supplement to granular fertilizer programs for a quick plant uptake
Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Develops deep green foliage, vigorous root systems and a solid plant structure
- Derived from fish soluble, can be used from indoor and outdoor. Can be used on plants and trees.
- Mixes with water and can be used by any convenient method of application. Shake well before use.
- 5-1-1 Fertilizer contains 5% Nitrogen, 1% Phosphate and 1% Soluble Potash.
- For plants mix 1-2 tbsp per 1 gal of water. For trees mix 4 tbsp per gal of water.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Buying Guide
FAQs
What NPK ratio should I look for in a fish fertilizer for lawns?
For a healthy, green lawn, a higher nitrogen ratio such as 15-0-15 or 16-4-8 is ideal because nitrogen drives leaf growth and color. Balanced formulas like 5-1-1 work well for overall plant health but may not deliver the same rapid greening. Choose a ratio that matches your lawn’s current condition and your desired results.
How do liquid fish fertilizers compare to emulsions for grass health?
Liquid fish fertilizers, like the GS Plant Foods Fish & Kelp blend, dissolve quickly and can be applied as a foliar spray or soil drench for fast nutrient uptake. Emulsions, such as Alaska Fish Emulsion, release nutrients more slowly and are less likely to cause burn, making them suitable for regular feeding. Both types provide organic nutrition, but liquids often give a quicker visual boost.
Which product offers the best value per ounce for a large lawn?
The Superior 15-0-15 Liquid Lawn Fertilizer provides a high nitrogen content in a concentrated formula, delivering strong greening at a lower cost per ounce for extensive areas. Compared to smaller 18‑ounce bottles like Neptune’s Harvest, the larger gallon containers of Alaska Fish Emulsion or GS Plant Foods spread the price over more applications. Evaluate the price per ounce and the recommended application rate to determine true value.
Are there any fish fertilizers that are odor‑free or low‑odor?
Alaska Fish Emulsion is deodorized with natural wintergreen, offering a milder scent than many traditional fish emulsions. Neptune’s Harvest claims to retain fish proteins without the unpleasant odor, thanks to its cold‑process method. If scent is a concern, look for products that specifically mention deodorization or low‑odor formulations.
How important is OMRI certification when choosing a fish fertilizer?
OMRI certification guarantees that the product meets organic standards and can be used in certified organic gardens, which is valuable for growers following strict regulations. Products like Alaska Fish Fertilizer and GS Plant Foods carry this certification, providing peace of mind about ingredient purity. While not mandatory for all lawns, OMRI status adds credibility and safety for organic gardening.
Can I use a fish fertilizer that also contains kelp or seaweed on my lawn?
Yes, blends that combine fish with kelp or seaweed, such as GS Plant Foods Liquid Fish & Kelp Fertilizer, supply additional micronutrients and hormones that improve root development and stress tolerance. These additives enhance soil biology and can lead to a more resilient turf. Just follow the dilution instructions to avoid over‑application.
What are the benefits of higher nitrogen formulas like 15-0-15 versus balanced 5-1-1?
Higher nitrogen formulas deliver rapid greening and thickening of grass blades, which is ideal for spring and summer revitalization. Balanced 5-1-1 formulas support overall plant health, root growth, and nutrient availability over a longer period. Use a high‑nitrogen product when you need an immediate visual boost, and a balanced blend for sustained, holistic lawn health.
How often should I apply fish fertilizer to maintain a green lawn?
Most liquid fish fertilizers recommend application every 2–4 weeks during the growing season, allowing the soil microbiome to process the organic nutrients. For slower‑release emulsions, a monthly schedule is typically sufficient. Adjust frequency based on lawn response, weather conditions, and the specific product’s label directions.