Comparison: Best Organic Hydrolyzed Liquid Fish Fertilizer (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, you’ve probably heard about organic hydrolyzed liquid fish fertilizer. But with so many options out there, how do you know which one truly delivers? We’ve dug into the details, tested the top contenders, and compared their ingredients, effectiveness, and value so you don’t have to. Let’s find your garden’s perfect match.
- Best for omri-certified hydrolysis: Indian River Organics OMRI Listed Organic
- Best for nutrient-rich blend: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
- Best for balanced 2-3-1: GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens
- Best for cold-pressed purity: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for odorless hormone boost: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for fish-kelp synergy: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for versatile sea blend: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for high-nitrogen boost: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin-rich emulsion: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for fast-acting kelp: Down To Earth All Natural Fertilizers Organic Liquid Fish & Kelp Concentrate – Plant Food for Vegetable Gardens and Flower Beds – Makes up to 32 Gallons 2-4-1
Product Comparison: Best Organic Hydrolyzed Liquid Fish Fertilizer
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.
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.
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).
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!
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
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.
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.
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
Down To Earth All Natural Fertilizers Organic Liquid Fish & Kelp Concentrate – Plant Food for Vegetable Gardens and Flower Beds – Makes up to 32 Gallons 2-4-1, 32 oz
- Fast‑acting liquid formula: Perfect for foliar feed or soil drench applications, supporting quick absorption and growth stimulation.
- Stimulates overall plant vigor: High phosphorus aids flowering and fruiting, while nitrogen supports lush foliage and root development.
- Organic & soil‑friendly: Helps promote beneficial microbial activity and sustainable soil health due to its fish and kelp base
- Versatile application rates: For general garden use: ¼–½ cup per gallon of water; for containers: 2–4 Tbsp per gallon; for houseplants: 2 Tbsp per gallon, repeated every 2–4 weeks depending on growth stage
- Watch out for odor: While extremely effective, many users report a strong fish-like odor characteristic of fish emulsions—though it typically subsides quickly and doesn’t linger long indoors
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 factors should I consider when selecting an organic hydrolyzed liquid fish fertilizer?
Look for OMRI certification, which guarantees compliance with organic standards, and check the nutrient ratio (N‑P‑K) to match your plant’s growth stage. Also evaluate the source of the fish (fresh, food‑grade vs. waste) and whether the product is a true hydrolysate or an emulsion, as hydrolysates retain more amino acids and hormones. Finally, consider ease of use, equipment compatibility, and any odor issues that might affect indoor applications.
How does Indian River Organics’ hydrolyzed fish fertilizer compare to GS Plant Foods’ liquid fish products?
Indian River Organics emphasizes a proprietary cold‑process that preserves complex nutrients and boasts a 100 % OMRI‑listed seal, while GS Plant Foods offers both a pure fish concentrate (2‑3‑1 NPK) and a fish‑kelp blend with similar certification. The Indian River product highlights contaminant‑free, pet‑friendly formulation and equipment‑friendly solubility, whereas GS Plant Foods stresses a broader macro‑ and micro‑nutrient profile and synergistic use with kelp. Both are water‑soluble, but Indian River’s guarantee focuses on consistency, while GS Plant Foods provides more detailed application guidance for various crops.
Why does the N‑P‑K ratio matter, and how do the ratios differ among the listed fertilizers?
The N‑P‑K ratio indicates the balance of nitrogen for foliage, phosphorus for root and flower development, and potassium for overall health; matching the ratio to your plant’s stage maximizes efficiency. Indian River Organics does not list a specific ratio but markets a “superior” nutrient complex, while GS Plant Foods offers a 2‑3‑1 ratio ideal for balanced growth, and Neptune’s Harvest provides a 2‑4‑1 ratio that leans toward stronger root development. Choosing a product with a ratio that aligns with your garden’s needs can reduce over‑fertilization and improve results.
Which fertilizer is best suited for lawns versus vegetable or fruit gardens?
For lawns, the higher nitrogen content of Indian River Organics or the 2‑3‑1 GS Plant Foods concentrate works well, especially when mixed at the recommended 1 gallon per 30‑40 gallons of water. Vegetable and fruit growers often prefer the balanced 2‑3‑1 or 2‑4‑1 ratios found in GS Plant Foods and Neptune’s Harvest, as they support both foliage and fruit set without excessive nitrogen. Fish‑kelp blends like GS Plant Foods Fish & Kelp or Down To Earth add extra micronutrients that benefit flowering and fruiting crops.
Do any of these products have strong fish odors, and does that affect their usability?
All genuine fish fertilizers retain some odor; the 1‑gallon organic fish emulsion (B09FZTPQJL) explicitly notes a pungent smell as a sign of authenticity. Products processed via cold hydrolysis, such as Indian River Organics and Neptune’s Harvest, tend to have a milder scent because the oils are removed, making them more suitable for indoor or patio use. If odor is a concern, choose a hydrolysate with reduced oil content or apply the fertilizer when the garden is not in close proximity to living spaces.
Is OMRI certification essential, and which of these fertilizers carry that label?
OMRI certification ensures the product meets USDA organic standards and can be used in certified organic production, which is crucial for growers seeking compliance. Indian River Organics, GS Plant Foods (both the pure fish and fish‑kelp blends), and Alaska Fish Fertilizer all display OMRI listing. Products without the label, such as some generic fish emulsions, may still be organic but lack the formal verification needed for organic certification.
How do application rates differ between fish‑only fertilizers and fish‑kelp blends?
Fish‑only concentrates like Indian River Organics and GS Plant Foods typically recommend 4 oz per gallon of water for most applications, while fish‑kelp blends often suggest a slightly lower rate (2‑3 oz per gallon) because the kelp adds additional nutrients. For lawns, a higher dilution (1 gallon per 30‑40 gallons of water) is common, whereas container plants may need only 1‑2 tbsp per gallon. Always follow the manufacturer’s guidance for the specific crop and growth stage to avoid over‑application.
What value considerations should I evaluate when comparing these fertilizers?
Beyond price per gallon, assess the concentration of nutrients, the presence of micro‑minerals, and any additional benefits like soil microbiology support or equipment compatibility. Products like Indian River Organics offer a quality guarantee and equipment‑friendly formulation, which can save time and reduce maintenance costs. Comparing the cost per ounce of active nutrient content, as well as the longevity of each application (e.g., how often you need to re‑apply), helps determine overall value.