Comparison: Best Bulk Fish Fertilizer (Updated | Dec 1st)
We’ve all heard the hype—stronger plants, greener leaves, and healthier soil—but with so many options out there, how do you know which one’s truly the best? After digging into ingredients, customer reviews, and real garden results, we’ve narrowed down the top contenders. Whether you’re growing tomatoes or tending to flowers, stick around—your soil (and your plants) will thank you.
- Best for omri certified blend: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for wintergreen deodorized: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for fish‑kelp boost: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for cold‑pressed power: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for vitamin‑rich formula: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for bloom‑boost seaweed: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)
- Best for odorless chelated: Neptune’s Harvest Fish Fertilizer 2-4-1
- 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 odor‑free powder: Fish Emulsion Fertilizer 12-2-2 Powder (3.3 pounds Powder-Up to 300 Gallons of Water)
- Best for soil‑life enhancer: Just Scentsational Bare Ground Solutions TP-128G Trident’s Pride Organic Liquid Fish Hydroponic Soil Fertilizer
Product Comparison: Best Bulk Fish Fertilizer
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
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
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.
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!
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
Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)
- 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
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
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).
Fish Emulsion Fertilizer 12-2-2 Powder (3.3 pounds Powder-Up to 300 Gallons of Water), for Vegetables, Trees, Lawns, Shrubs, Flowers, Fruits
- Organic Fish Protein :12-2-2 NPK powder made from 100% fish dried liquid powder, ground, and highly water-soluble when mixed.
- 2× Super Concentrated Powder: 1 lb (≈450 g) makes up to 100 gal of liquid feed,ideal for both large veggie plots and indoor/hydro gardens, creating high-value yield.
- Proven Results and Trusted Organic Fertilizer: Comparison experient conducted on same seed, same soil. The fertilizer supports visible growth and robust fruit set.
- Promotes Healthier Roots & Foliage: Rich in natural amino acids and micronutrients, boosts plant stress resistance, soil biology, and nutrient uptake.
- Reduced Odor, Easy to Use: Dry powder form alleviates the strong “fishy” smell of traditional emulsions. Simple to store, measure, and apply; mix and water every 1–2 weeks.
- Sustainable & Responsibly Sourced: Made in small batches from by products of the fish meal industry, organically biodegradable with minimal waste.
- Includes a teaspoon for ease of measurement
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 NPK ratio should I choose for a general-purpose garden?
For most vegetable, fruit, and flower gardens a balanced 5-1-1 or 2-3-1 ratio works well, providing steady nitrogen while supplying phosphorus and potassium. Products like Alaska Fish Fertilizer OMRI Listed 5-1-1 and GS Plant Foods Liquid Fish & Kelp use these ratios. If you need a higher nitrogen boost for leafy growth, a 12-2-2 powder can be a good choice, but it may be over‑kill for fruiting plants.
How does liquid fish fertilizer compare to powdered fish emulsion in terms of odor and storage?
Liquid emulsions, such as the 1‑gallon Alaska Fish Emulsion, retain a strong fishy smell because the nutrients are not fully processed, which some gardeners find off‑putting. Powdered forms like the 12‑2‑2 Fish Emulsion Powder reduce odor dramatically and are easier to store without risk of spills. However, liquids are ready to dilute and apply, while powders require mixing before use.
Is an OMRI‑listed fertilizer important for organic gardening?
Yes, OMRI (Organic Materials Review Institute) certification guarantees the product meets organic standards, making it safe for certified organic plots. Several options—including Alaska Fish Fertilizer 5‑1‑1 and GS Plant Foods Liquid Fish & Kelp—carry this listing. Choosing an OMRI‑listed product ensures compliance with organic labeling and avoids synthetic additives.
Which bulk fish fertilizer gives the best value per gallon?
When evaluating cost per nutrient, the 1‑gallon Alaska Fish Emulsion and the GS Plant Foods Liquid Fish & Kelp both provide high nutrient density with relatively low price points. The 12‑2‑2 powder, although sold in smaller weight, stretches to up to 100 gallons of feed per pound, offering exceptional value for large plots. Compare the total NPK content delivered per dollar to decide which fits your budget.
Can I use fish fertilizer on both indoor and outdoor plants?
Absolutely; most fish‑based products are formulated for universal use, including houseplants, container gardens, and field crops. Items like Central Garden Brands Fish Emul Fertilizer and Alaska Fish Fertilizer OMRI Listed specifically note suitability for indoor and outdoor applications. Just follow dilution guidelines to avoid over‑feeding indoor foliage.
What are the benefits of adding seaweed or kelp to a fish fertilizer?
Seaweed blends, such as the GS Plant Foods Liquid Fish & Kelp, provide trace minerals, hormones, and vitamins that enhance root development and stress tolerance. The kelp component also improves soil microbiology, helping plants absorb nutrients more efficiently. This synergy can lead to stronger blooms and higher fruit yields compared to pure fish emulsion.
How often should I apply a liquid fish fertilizer versus a powdered one?
Liquid fish fertilizers are typically applied every 2–4 weeks as a foliar spray or soil drench, allowing for quick nutrient uptake. Powdered formulations, once mixed into a liquid feed, can be applied on a similar schedule but often require a larger initial dilution, stretching the product over many applications. Consistency is key; regular, light feedings outperform occasional heavy doses.
Do any fish fertilizers claim to be odor‑free?
Yes, the Alaska Fish Emulsion mentions a natural wintergreen deodorizer that masks the typical fish smell. Neptune’s Harvest Fish Fertilizer also advertises a low‑odor profile due to its cold‑process method that retains nutrients while minimizing scent. If odor is a concern for indoor use, choose one of these deodorized options.