Comparison: Best Hydrolyzed Fish Fertilizer (Updated | Nov 11th)
If you’re looking to give your garden a serious nutrient boost, hydrolyzed fish fertilizer might just be your new best friend. But with so many options on the market, how do you know which one delivers real results without breaking the bank? We’ve dug into the details, tested the top contenders, and compared ingredients, effectiveness, and value so you don’t have to.
- Best for all‑natural growth: Organic Hydrolyzed Liquid Fish Fertilizer by GS Plant Foods (1 Gallon)
- Best for cold‑process power: Neptune’s Harvest Hydrolyzed Fish Fertilizer
- Best for odor‑free formula: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for chelated nutrients: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for omri certified: Indian River Organics OMRI Listed Organic
- Best for bulk value: Hydrolyzed Fish Fertilizer 2-4-1 Net Wt. 9lb
- Best for growth boost: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
- Best for smell‑true emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for fruit‑flower focus: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for fish‑kelp combo: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
Product Comparison: Best Hydrolyzed Fish Fertilizer
Organic Hydrolyzed Liquid Fish Fertilizer by GS Plant Foods (1 Gallon)
- OMRI ORGANIC LISTED HYDROLYZED FISH FERTILIZER: GS Plant Foods Organic Liquid Fish is an all-natural high quality fresh fish liquid fertilizer that gives excellent plant growth, rebuilds soil, and offers higher production yields. Our fish fertilizer will help stimulate growth and improve plant health and color. Tremendously beneficial for soil quality and improved rooting, this organic fish fertilizer can be applied to any type of soil or plant without concern for waste or harmful chemicals.
- PACKED WITH MACRO & MICRO NUTRIENTS: Our proprietary and all-natural fish fertilizer provides much more than N-P-K (Nitrogen, Phosphorus and Potassium) found in synthetic fertilizers. This fish plant fertilizer provides a comprehensive mix of macro & micro nutrients, minerals, peptides, proteins, and calcium, all in a usable form perfectly suited for maximum efficiency of uptake for your plants. The fish plant food fertilizer stimulates water penetration and increases nutrient assimilation.
- OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, liquid fish fertilizer organic acts as an efficacious growth promoter. GS Plant Foods organic hydrolyzed fertilizer promotes growth of healthy bacteria. It is used extensively on a commercial basis, as well as at home as an organic soil conditioner. The end result is a powerfully effective, organic fertilizer and soil supplement that contains no chlorine or heavy metals. It is great for everything that grows!
- WORKS SYNERGISTICALLY WITH ALL FERTILIZERS:This liquid fish fertilizer is among the highest quality plant food products that you can get. It works synergistically with all fertilizers especially with a high quality liquid kelp fertilizer such as GS Plant Foods Organic Liquid Kelp. Use fish fertilizer on lawns, vegetables, fruits, trees & shrubs, seedlings and transplants as a regular healthful maintenance program to experience healthier plants with stronger, and more developed root systems.
- EASY TO APPLY FOR NATURAL GREAT RESULTS: Apply hydrolyzed fish fertilizer to improve specific growth stages. Apply generously to soil or as a foliar feed until leaves are wet, top and bottom. For lawns, one gallon of fertilizer mixed with 30-40 gallons of water will cover ¼ acre. Feed lawn every 4 weeks. Trees and shrubs use 4 oz per gallon of water. Feed by boring small holes 1 to 2 feet away from the root ball. Fill holes with solution. For best results, foliar feed early or late in the day.
Neptune’s Harvest Hydrolyzed Fish Fertilizer
- Sold on Amazon
Neptune’s Harvest Fish Fertilizer 2-4-1, 36 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
Neptune’s Harvest Fish Fertilizer 2-4-1, Gallon
- An organic fertilizer made from fresh North Atlantic fish
- Made by a unique cold process that protects the vitamins, amino acids, enzymes and growth hormones
- Contains all the micro and macro nutrients naturally found in fish
- The nitrogen and other nutrients are chelated, so they are readily available for plants consumption
- The fish proteins and oils are retained and the fertilizer has no unpleasant odor
Indian River Organics OMRI Listed Organic, Hydrolyzed Liquid Fish Fertilizer, 1 Quart / 36 ounces net wt.
- Far Superior to Emulsions: Our Proprietary Cold-Process Hydrolysis Preserves the Complex Nutrients that create Bigger Flower Blooms, Tastier Fruits & Vegetables, and Vibrant Green Lawns.
- 100% OMRI-LISTED Organic: Has the Organic Materials Review Institute (OMRI) seal (our competitors don’t)! Approved & suitable for use in certified organic operations under the USDA National Organic Program.
- Free of Contaminants: Our High-Quality Hydrolysate Fertilizer is Sustainably Produced from fresh, healthy, food-quality fish, free of chlorine, mercury, and other heavy metals. Family & pet friendly.
- EASY TO USE and Won’t Clog Equipment: Water Soluble; Just Mix with Water and Apply! We win new customers because our product works flawlessly with application equipment. Safely access your lawn after application. No waiting period.
- 100% Quality Guarantee: We’re incredibly proud of our product’s consistency, and we guarantee our nutrient analysis in every bottle. If you have concerns, let us know and we’ll be happy to work with you.
Hydrolyzed Fish Fertilizer 2-4-1 Net Wt. 9lb
- Sold on Amazon
GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost, OMRI-Certified, Hydrolyzed, Fish-Based, Organic Gardening Solution, 1 Quart
- OMRI ORGANIC LISTED HYDROLYZED FISH FERTILIZER: GS Plant Foods Organic Liquid Fish is an all-natural high quality fresh fish liquid fertilizer that gives excellent plant growth, rebuilds soil, and offers higher production yields. Our fish fertilizer will help stimulate growth and improve plant health and color. Tremendously beneficial for soil quality and improved rooting, this organic fish fertilizer can be applied to any type of soil or plant without concern for waste or harmful chemicals.
- PACKED WITH MACRO & MICRO NUTRIENTS: Our proprietary and all-natural fish fertilizer provides much more than N-P-K (Nitrogen, Phosphorus and Potassium) found in synthetic fertilizers. This fish plant fertilizer provides a comprehensive mix of macro & micro nutrients, minerals, peptides, proteins, and calcium, all in a usable form perfectly suited for maximum efficiency of uptake for your plants. The fish plant food fertilizer stimulates water penetration and increases nutrient assimilation.
- OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, liquid fish fertilizer organic acts as an efficacious growth promoter. GS Plant Foods organic hydrolyzed fertilizer promotes growth of healthy bacteria. It is used extensively on a commercial basis, as well as at home as an organic soil conditioner. The end result is a powerfully effective, organic fertilizer and soil supplement that contains no chlorine or heavy metals. It is great for everything that grows!
- WORKS SYNERGISTICALLY WITH ALL FERTILIZERS:This liquid fish fertilizer is among the highest quality plant food products that you can get. It works synergistically with all fertilizers especially with a high quality liquid kelp fertilizer such as GS Plant Foods Organic Liquid Kelp. Use fish fertilizer on lawns, vegetables, fruits, trees & shrubs, seedlings and transplants as a regular healthful maintenance program to experience healthier plants with stronger, and more developed root systems.
- EASY TO APPLY FOR NATURAL GREAT RESULTS: Apply hydrolyzed fish fertilizer to improve specific growth stages. Apply generously to soil or as a foliar feed until leaves are wet, top and bottom. For lawns, one gallon of fertilizer mixed with 30-40 gallons of water will cover ¼ acre. Feed lawn every 4 weeks. Trees and shrubs use 4 oz per gallon of water. Feed by boring small holes 1 to 2 feet away from the root ball. Fill holes with solution. For best results, foliar feed early or late in the day.
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!
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 & 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.
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 is hydrolyzed fish fertilizer and how does it differ from regular fish emulsion?
Hydrolyzed fish fertilizer is produced by breaking down fish proteins through a cold‑process hydrolysis, preserving amino acids, vitamins, and hormones. Regular fish emulsion typically involves heat or mechanical emulsification, which can destroy some of those delicate nutrients and often leaves a stronger fish odor. The hydrolyzed form is more readily absorbed by plants and usually has a milder smell.
How do the OMRI‑listed options compare in terms of certification and organic compliance?
All products marked OMRI‑listed, such as GS Plant Foods Organic Liquid Fish, Indian River Organics Hydrolyzed Liquid Fish, and Alaska Fish Fertilizer, meet the USDA National Organic Program standards. They are approved for use in certified organic production, meaning no synthetic chemicals or prohibited additives. However, the exact nutrient analysis and additional claims (like kelp inclusion) can vary between brands.
Which product offers the best value per gallon for large garden use?
GS Plant Foods Organic Liquid Fish (1 gallon) and Indian River Organics Hydrolyzed Liquid Fish (1 gallon) are priced similarly but the GS product includes a detailed application guide and synergistic use with kelp, adding extra versatility. For pure cost‑per‑gallon, the 9 lb bulk Hydrolyzed Fish Fertilizer (B007ZZ8OYM) can be more economical if you prefer a powder that you dilute yourself. Consider your preferred format—liquid vs. powder—when judging overall value.
Are there noticeable odor differences among the listed brands, and does that affect performance?
Brands that use true hydrolysis, like Indian River Organics and Neptune’s Harvest, report a reduced fishy smell compared with traditional emulsions. The 1‑gallon Organic Fish Emulsion (B09FZTPQJL) explicitly notes a strong odor, which some gardeners find off‑putting but does not diminish nutrient content. Odor is mainly a comfort issue; performance is driven by nutrient retention, not scent.
How should I mix and apply the liquid fertilizers for lawns versus container plants?
For lawns, a common ratio is 1 gallon of fertilizer mixed with 30‑40 gallons of water, applied every 4 weeks as a soil drench or light foliar spray. In containers, dilute to about 2‑4 oz per gallon of water and apply directly to the soil or as a misted foliar feed, repeating every 2‑3 weeks. Always water the plants before and after application to prevent burn and improve nutrient uptake.
What macro and micronutrients are typically present, and which brands highlight a broader spectrum?
All hydrolyzed fish fertilizers provide nitrogen, phosphorus, potassium, plus trace minerals like calcium, magnesium, and iron, along with peptides and amino acids. GS Plant Foods emphasizes a comprehensive mix of macro‑ and micro‑nutrients, while Indian River Organics stresses the preservation of vitamins and hormones through cold‑process hydrolysis. Neptune’s Harvest also notes chelated nitrogen for rapid plant availability.
Is there a benefit to using a fish‑fertilizer together with kelp, and which product includes both?
Combining fish fertilizer with kelp adds additional hormones, micronutrients, and sea‑derived growth stimulants that can boost root development and stress tolerance. GS Plant Foods offers a combined Liquid Fish & Kelp Fertilizer (1 gallon) that delivers both sources in a single, OMRI‑listed formula, simplifying application and ensuring balanced nutrition.
How do the cold‑process hydrolysis methods impact nutrient retention across the brands?
Cold‑process hydrolysis avoids high temperatures that can denature proteins, preserving amino acids, enzymes, and growth hormones. Brands like Indian River Organics and Neptune’s Harvest specifically market this method, claiming higher nutrient potency and a longer shelf life. Products that do not mention cold processing may still be effective but could have slightly reduced levels of heat‑sensitive compounds.