Comparison: Best Organic Liquid Fish Fertilizer (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, organic liquid fish fertilizer is a powerhouse choice—but with so many options out there, how do you know which one’s best? We’ve dug into the details, tested the top contenders, and compared ingredients, effectiveness, and value so you don’t have to. Let’s explore the leading brands and find the perfect fit for your thriving, eco-friendly garden.
- Best for comprehensive nutrient boost: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
- Best for sustainable fish emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for fish & kelp fusion: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for compact fish kelp: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for versatile vitamin boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for high npk power: Alaska Fish Fertilizer OMRI Listed 5-1-1
- 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
- Best for balanced 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 microbe boost liquid: Just Scentsational Bare Ground Solutions TP-128G Trident’s Pride Organic Liquid Fish Hydroponic Soil Fertilizer
- Best for vegetative growth formula: Grow 3-1-2 Organic Liquid Fertilizer
Product Comparison: Best Organic Liquid Fish Fertilizer
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!
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.
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
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
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
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).
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.
Grow 3-1-2 Organic Liquid Fertilizer, Vegitative, Fish Based, Safe, Organic, All Purpose, Nutrient, Plant Safe (8 Ounce)
- Optimal Growth Formula: Specifically designed for soil growers, suitable for both indoor and outdoor use in any soil media. Great for vegetable gardens, flowers, indoor plants and trees. Excellent nutrient to use on plants and herbs during the vegetative stage.
- Easy Application: No need to worry about PPM or PH levels (as long as tap water is within the normal range). Just one tablespoon mixed per gallon of water, fed weekly. Since its Organic you don’t have to worry about burning your plants or roots like with synthetic fertilizers.
- Organic: Registered Organic with the California Dept. of Food and Agriculture (CDFA), ensuring a safe and effective product. Keep the life and biology in your soil by using this premium organic fertilizer.
- Nutrient-Rich Ingredients: Made from sugar beet extract, corn steep liquor, reduced sugar molasses, and acidulated fish tankage to provide essential nutrients your plants will love.
- Complete Feeding Solution: Best results when used alongside other recommended Mission Fertilizers according to the feeding schedule. We have an organic solution for all stages of growth.
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 ingredients should I look for in an organic liquid fish fertilizer?
The most important components are hydrolyzed fish protein, kelp or seaweed, and a balanced N‑P‑K ratio (typically around 2‑3‑1). These ingredients provide macro nutrients, trace minerals, and natural growth hormones that improve root development and overall plant health. Look for OMRI‑listed or OMRI‑certified products to ensure they meet organic standards.
How does the N‑P‑K ratio affect plant growth when choosing a fish fertilizer?
A lower nitrogen ratio (e.g., 2‑3‑1) encourages steady, sustainable growth without the risk of leaf burn, while higher nitrogen formulas can boost rapid foliage development. For most garden vegetables, flowers, and fruiting plants, a 2‑3‑1 ratio offers a balanced blend that supports both vegetative and reproductive stages. Choose a higher nitrogen blend only if you need a quick green boost for leafy crops.
What are the advantages of a fish‑and‑kelp blend versus a fish‑only formula?
Kelp adds natural cytokinins, auxins, and micronutrients that enhance flowering, fruit set, and stress tolerance, complementing the nitrogen‑rich fish emulsion. A blend typically improves soil microbiology and nutrient uptake more than fish alone, making it a versatile choice for a wide range of plants. If you only need a simple nitrogen boost, a pure fish fertilizer can be sufficient, but the blend offers broader benefits.
How do the GS Plant Foods products compare in price and concentration?
GS Plant Foods offers both 1‑gallon and 36‑oz bottles; the larger gallon provides a lower cost per ounce but requires more dilution water. The 36‑oz version is convenient for small gardens and indoor plants, while the gallon is ideal for larger lawns or commercial use. Both are OMRI‑listed and share the same 2‑3‑1 ratio, so value depends on the scale of your garden.
Is the strong fish odor a sign of quality or a drawback?
A noticeable fishy smell indicates that the product contains real, unrefined fish emulsion, which means the nutrients are intact and bioavailable. While the odor can be off‑putting during application, it typically dissipates quickly and does not affect plant health. If odor is a concern for indoor use, choose a low‑odor formulation or apply it outdoors with proper ventilation.
Can I mix fish fertilizer with other organic fertilizers, like compost tea or kelp?
Yes, fish fertilizer works synergistically with other organic inputs; it can enhance the microbial activity that compost tea promotes. When mixing, follow the dilution rates on each product to avoid over‑feeding and maintain a balanced nutrient profile. Combining fish emulsion with kelp or a compost tea often results in healthier soil and more vigorous plant growth.
What application methods give the best results for fish fertilizers?
Both soil drench and foliar spray are effective; a soil drench delivers nutrients directly to the root zone, while a foliar spray provides rapid uptake of micronutrients. For lawns, mix 1 gallon of fertilizer with 30‑40 gallons of water and apply every 4 weeks. For containers and houseplants, a 2‑4 Tbsp per gallon of water applied every 2‑3 weeks works well.
How do I evaluate value beyond price when choosing a fish fertilizer?
Consider the concentration, OMRI certification, inclusion of kelp or seaweed, and the recommended application rates. A product that requires less dilution or offers a broader nutrient spectrum can provide better long‑term value despite a higher upfront cost. Reading customer reviews for consistency, odor, and plant response also helps ensure you select a reliable, high‑performing fertilizer.