Comparison: Best Organic Fish Fertilizer (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, you’ve probably heard about organic fish fertilizer. But with so many options out there, how do you know which one’s truly the best? We’ve done the research, tested the top contenders, and compared everything from nutrient content to smell and ease of use. Let’s dive into the **best organic fish fertilizer**s that deliver real results.
- Best for vitamin-rich boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for omri certified blend: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for cold-pressed yield: 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 vibrant garden mix: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for wintergreen no-burn: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for odorless protein boost: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for root-boost bone: Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds
- Best for high-nitrogen bulk: Fish Meal – Organic Fish Fertilizer 8-6-0 (5 lbs)
- Best for macro-micro power: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
Product Comparison: Best Organic Fish Fertilizer
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
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.
Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 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
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
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
Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds, Bulbs, Blooms, Flower Beds 4-12-0, 5 lb
- Water-Soluble Formula – Easily dissolves in water for quick absorption and efficient nutrient delivery directly to the root zone
- Targets Root Development – Formulated to enhance root growth, improving plant stability, nutrient uptake, and drought resistance
- Fast-Acting Nutrients – Provides immediate access to essential nutrients like nitrogen, phosphorus, and potassium where roots need them most.
- Ideal for Transplants & Seedlings – Great for jumpstarting young plants or helping transplants establish quickly in new soil.
- Improves Soil-Root Interaction – Encourages a healthy rhizosphere, boosting microbial activity and root-zone nutrient cycling.
Fish Meal – Organic Fish Fertilizer 8-6-0 (5 lbs)
- Organic Fish Meal – All Natural Fertilizer!
- Excellent Source of Nitrogen and Phosphorus!
- Stimulates beneficial microbes
- 5 pound bulk bag of Organic Fish Meal Fertilizer
- Fish Meal is a perfect early season Organic 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.
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 should I look for when choosing an organic fish fertilizer?
Check the NPK ratio to match your plant’s nutrient needs, and verify that the product is OMRI listed or certified organic for reliable compliance. Look for additional ingredients like kelp or seaweed, which can boost micronutrients and soil microbiology. Also consider the concentration and whether the formula is deodorized if odor is a concern.
How do liquid fish emulsions compare to fish meal granules?
Liquid emulsions, such as the 1‑gallon fish emulsion, provide quick nutrient uptake and are easy to apply as a foliar spray or soil drench, while fish meal granules release nutrients slowly over time. Granular fish meal, like the 5‑lb 8‑6‑0 option, is ideal for early‑season feeding and can improve soil structure long‑term. Choose liquids for fast results and granules for sustained feeding.
Is there a noticeable difference in odor between products?
Traditional fish emulsions often have a strong fishy smell, which is a sign of authentic fish content, as seen in the 1‑gallon emulsion that advertises its pungent aroma. Some brands, like Alaska Fish Emulsion, deodorize their formula with natural wintergreen to reduce odor. If scent is a major concern, opt for deodorized or low‑odor options.
Which product offers the best value for large gardens?
For extensive coverage, the 1‑gallon organic fish emulsion provides a high volume at a competitive price and includes a balanced 2‑3‑1 NPK ratio suitable for frequent applications. The GS Plant Foods Liquid Fish & Kelp (1 gallon) also offers a versatile blend of fish and seaweed nutrients, supporting both soil health and plant growth. Compare unit pricing and consider the added benefits of kelp when evaluating overall value.
Do any of these fertilizers include additional micronutrients?
Yes, the GS Plant Foods Liquid Fish & Kelp fertilizer combines fish hydrolysate with North Atlantic seaweed, delivering trace minerals and micronutrients that aid nutrient uptake. Neptune’s Harvest Fish & Seaweed Fertilizer also blends fish with seaweed for a broader nutrient profile. Products that pair fish with kelp generally provide a richer micronutrient spectrum.
Can I use these fertilizers on indoor plants?
Most of the listed fish fertilizers are safe for indoor use, including the Central Garden Brands fish emulsion and the Alaska Fish Fertilizer, as they are formulated to be gentle and non‑burning. When using indoors, dilute according to the label and apply as a soil drench or light foliar spray to avoid excess moisture. Always monitor plant response and adjust frequency as needed.
What are the benefits of choosing an OMRI‑listed fish fertilizer?
OMRI‑listed products, such as Alaska Fish Fertilizer and GS Plant Foods Liquid Fish & Kelp, meet strict organic standards, ensuring they contain no prohibited synthetic chemicals. This certification gives confidence for use in certified organic gardens and reduces the risk of contaminating soil with unwanted residues. It also often reflects higher quality control and transparent ingredient sourcing.
How frequently should I apply fish fertilizer for optimal results?
Generally, liquid fish emulsions are applied every 2‑4 weeks as a soil drench or foliar spray, depending on plant growth stage and weather conditions. Granular fish meals can be incorporated into the soil once at planting or early in the season, providing a slow release of nutrients. Always follow the manufacturer’s recommended dilution rates and adjust based on plant response.