Comparison: Best Liquid Fish Fertilizer For Lawns (Updated | Dec 1st)
If you’re looking to give your lawn that lush, green glow, liquid fish fertilizer might just be your secret weapon. But with so many options out there, how do you know which one delivers real results without breaking the bank? We’ve dug into the best liquid fish fertilizers on the market—balancing effectiveness, ease of use, and value—so you can skip the guesswork. Whether you’re reviving tired grass or boosting a healthy lawn, we’ll help you find the perfect fit for a thriving yard you’ll love showing off.
- Best for ocean‑powered growth: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for 15‑0‑15 sprayer pack: Superior 15-0-15 Liquid Lawn Fertilizer – Lawn Food for Growth & Green – Nitrogen
- Best for balanced 16‑4‑8 blend: 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 low‑npk garden boost: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for organic 2‑3‑1 formula: GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens
- Best for pure kelp extract: GS Plant Foods Liquid Kelp Fertilizer – Suitable for Organic Growing
- Best for fish‑kelp dual power: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for sustainable fish emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for trace‑mineral boost: Harris Organic Plant and Lawn Fertilizer
- Best for microbe‑rich liquid: Just Scentsational Bare Ground Solutions TP-128G Trident’s Pride Organic Liquid Fish Hydroponic Soil Fertilizer
Product Comparison: Best Liquid Fish Fertilizer For Lawns
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.
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.
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
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
GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens, Lawns & Container Growing
- Organic Materials Review Institute Listed for Organic Production Approved as GS Plant Foods Organic Liquid Fish Concentrate 2-3-1. Suitable for organic growing under OMRI and NOP standards.
- Balanced Nutrient Formula (2-3-1) Provides primary nutrients from hydrolyzed fish for sustained plant nutrition and soil health.
- Versatile Garden Use: Ideal for vegetables, lawns, flowers, shrubs, trees, fruit, and container plants when used as directed.
- Simple Application: Mix 4 oz per gallon of water for most uses. Apply generously to soil or as a foliar feed until leaves are wet.
- Florida Licensed Manufacturer: Produced by GS Plant Foods, LLC (License F003717). 1 Gallon liquid fertilizer (8.9 lb).
GS Plant Foods Liquid Kelp Fertilizer – Suitable for Organic Growing, OMRI Listed Seaweed Concentrate for Lawns, Gardens & Soil – 1 Gallon (Makes Up To 800+ Gallons)
- Organic Materials Review Institute Listed for Organic Use- Certified for use in organic gardening and farming, this natural seaweed extract fertilizer made from Ascophyllum Nodosum provides a balanced source of trace minerals and organic compounds that nourish plants and soil.
- Supports Soil Health & Nutrient Availability- Helps maintain favorable soil conditions and assists in nutrient uptake from the soil, contributing to healthy, productive plants.
- Suitable for All Types of Plants- Safe and effective for vegetables, fruits, ornamentals, lawns, trees, and shrubs—used by home gardeners and commercial growers as part of a regular fertility program.
- Simple, Flexible Application- Mix 2 ounces of concentrate per gallon of water and apply to soil or foliage with a sprayer, watering can, or hose-end sprayer. One gallon of solution treats up to 1,000 sq. ft.
- Trusted Quality from GS Plant Foods- We take pride in producing sustainable, high-quality organic fertilizers that are easy to use and compatible with any growing system. Consistent performance backed by a satisfaction commitment.
Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables, Trees, Lawns, Shrubs, Flowers, Seeds & Plants – Hydrolyzed Fish and Seaweed Blend
- OMRI ORGANIC LISTED FISH AND SEAWEED BLEND: GS Plant Foods all-natural liquid fish is a high quality organic product that gives excellent plant growth, rebuilds soil, and offers higher production yields. Kelp is often applied to any type of plants, trees, lawns, flowers, vegetables and seeds without concern for harmful runoff.
- OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, liquid seaweed fertilizer acts as an efficacious growth promoter. GS Plant Foods fish seaweed fertilizer is used extensively on a commercial basis, as well as at home for gardeners as an organic soil conditioner. This fish fertilizer for vegetables will lead to healthier crop yields and general plant well being.
- EASY TO APPLY FOR NATURAL GREAT RESULTS: Apply liquid fish & kelp fertilizer to improve specific growth stages. For House Plants; use 1 tablespoon per gallon of water. Feed every two weeks and do not over water. For Outdoor Plants; Use 2 fl. Oz per gallon of water. Feed vegetables, flowers, trees and shrubs every 2-3 weeks. Apply until soil is saturated or as a foliar feed until leaves are wet, top and bottom. For Lawns; use 2 to 4 oz concentrate per gallon of water to cover 1,000 sq. ft.
- TRUSTED & RELIABLE: At GS Plant Foods, we understand that you are placing your trust in us to provide you with the highest quality products available. We have 100% confidence in the quality of our products and continuously strive to deliver the best customer experience. Our products are organic, easy to use, cost efficient, sustainable, and yield consistent & amazing results in your garden, no matter what you’re growing or what medium in which your plants are growing.
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!
Harris Organic Plant and Lawn Fertilizer, Hydrolyzed Liquid Fish Fertilizer Emulsion Great for Tomatoes and Vegetables, 3-3-0.3, 32oz (32oz (Quart))
- Uses trace minerals and micronutrients naturally derived from fish
- Promotes vigorous growth of plants and vegetables
- Great for all indoor and outdoor plants
- For use in an Organic Gardening program
- Won’t burn plants
Just Scentsational Bare Ground Solutions TP-128G Trident’s Pride Organic Liquid Fish Hydroponic Soil Fertilizer, 128 oz (1 Gallon)
- Omri-rated, all-natural, Organic fish fertilizer adds proteins and enzymes to soil
- Increases anti-oxidants, sugar, and earthworm population
- Increased microbe production reduces the need for pesticides and creates stronger growth
- Comes in liquid fertilizer or soil conditioning granules for easy application
- Suggested use is 4-6oz per gallon 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 key nutrients should I prioritize in a liquid fish fertilizer for my lawn?
Look for a balanced N‑P‑K ratio that supplies ample nitrogen for green color, phosphorus for root development, and potassium for stress tolerance. Many fish‑based products also include trace minerals and seaweed extracts that improve nutrient uptake. A formula that combines these macronutrients with micronutrients will support a healthier, more resilient turf.
How does the N‑P‑K ratio affect lawn health, and which ratios are best for a typical residential lawn?
Higher nitrogen (15‑0‑15 or 16‑4‑8) promotes rapid greening, while a modest phosphorus level (4 % in a 16‑4‑8 blend) encourages strong root systems. A low‑phosphorus, low‑potassium mix such as 2‑3‑1 is gentle and ideal for frequent, light feedings, whereas 5‑1‑1 provides a very mild boost suitable for organic programs. Choose a ratio that matches your lawn’s growth stage and soil test results.
Are OMRI‑listed fish fertilizers worth the extra cost for organic lawns?
OMRI certification guarantees the product meets organic standards, meaning no synthetic chemicals or harmful residues. This can be important for homeowners who want to protect pollinators, children, and pets while still achieving vigorous growth. Although OMRI‑listed items may carry a premium, the long‑term soil health benefits often offset the price difference.
What are the benefits of adding kelp or seaweed to a fish fertilizer?
Kelp contributes natural hormones, vitamins, and over 60 trace minerals that improve stress resistance and nutrient absorption. When combined with fish emulsion, the seaweed enhances microbial activity in the soil, leading to better root development and drought tolerance. The synergy of protein‑rich fish and mineral‑rich kelp creates a more complete feeding program for lawns.
How do application rates differ among the listed products, and what does that mean for value?
Most concentrates recommend 2‑4 oz per gallon of water, covering roughly 1,000 sq ft per gallon of diluted solution. Products with higher N‑P‑K ratios (e.g., 15‑0‑15) often require less frequent applications, while milder blends (2‑3‑1) need more regular feeding. Considering both dilution rate and coverage, a product that treats more area per ounce generally offers better cost efficiency.
Which product offers the best cost per square foot for a typical 5,000 sq ft lawn?
The GS Plant Foods Liquid Fish & Kelp (1 gallon) treats up to 5,000 sq ft when mixed at 2 oz per gallon, giving roughly 0.20 oz of concentrate per 100 sq ft. The Superior 15‑0‑15 (1 gallon) also covers about 5,000 sq ft at a similar dilution, but its higher nitrogen content may require fewer re‑applications. When price points are comparable, the GS Plant Foods blend provides added kelp benefits, making it the most value‑rich choice for most homeowners.
Is the fishy odor of liquid fish fertilizers a concern for residential use?
All true fish emulsions retain a natural fish scent, which can be noticeable during mixing but dissipates quickly after application. The odor is an indicator of an authentic product; synthetic alternatives often lack it. If the smell is a concern, applying the fertilizer early in the morning or using a hose‑end sprayer can minimize lingering aromas.
How do liquid fish fertilizers compare to synthetic options in terms of soil health and long‑term value?
Fish‑based fertilizers feed beneficial microbes, improve soil organic matter, and enhance nutrient cycling, leading to healthier turf over time. Synthetic fertilizers provide rapid nutrient spikes but can leach, potentially harming the environment and reducing soil biology. Investing in a quality liquid fish product typically yields a more sustainable lawn with lower long‑term maintenance costs.