Comparison: Best Mixing Fish Fertilizer (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, you’ve probably heard about fish fertilizer—but with so many options out there, how do you know which one’s truly the best? We’ve dug into the smelly details, tested top brands, and compared ingredients, value, and results to help you choose wisely. Whether you’re growing tomatoes, flowers, or leafy greens, the right fish fertilizer can make all the difference. Let’s break down the top contenders and find the perfect fit for your thriving, eco-friendly garden.
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
Yield-Boosting Emulsion
- Best for vitamin-rich growth: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for omri certified blend: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for wintergreen fresh blend: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for deep green boost: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Best for yield-boosting emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for odorless protein power: 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 vibrant bloom booster: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for macro-micro mastery: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
- Best for aquarium plant nutrient: API LEAF ZONE Freshwater Aquarium Plant Fertilizer 8-Ounce Bottle
Product Comparison: Best Mixing 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
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
Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Develops deep green foliage, vigorous root systems and a solid plant structure
- Derived from fish soluble, can be used from indoor and outdoor. Can be used on plants and trees.
- Mixes with water and can be used by any convenient method of application. Shake well before use.
- 5-1-1 Fertilizer contains 5% Nitrogen, 1% Phosphate and 1% Soluble Potash.
- For plants mix 1-2 tbsp per 1 gal of water. For trees mix 4 tbsp per gal of 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!
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
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, 18 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
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.
API LEAF ZONE Freshwater Aquarium Plant Fertilizer 8-Ounce Bottle
- Product Type: ARTIFICIAL PLANT
- Package length: 19.558 cm
- Package width: 3.048 cm
- Package height: 4.572 cm
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 choosing a fish fertilizer?
Look at the N-P-K ratio to match your plant’s nutrient needs, and check if the product is OMRI‑listed for organic gardening. Consider the concentration (e.g., 5‑1‑1 vs 2‑4‑1) and whether the formula includes additional ingredients like kelp or seaweed. Finally, evaluate the odor level and any added benefits such as microbial stimulants.
How does a 5‑1‑1 fertilizer differ from a 2‑4‑1 formulation?
A 5‑1‑1 blend provides higher nitrogen, which promotes rapid leaf growth, while a 2‑4‑1 mix offers more phosphorus for root development and flower production. Choose 5‑1‑1 for leafy vegetables or fast‑growing greens, and 2‑4‑1 for blooming plants or fruiting crops. Both are organic, but the nutrient balance influences the plant stage you’re feeding.
Is there a noticeable performance difference between emulsified and hydrolyzed fish fertilizers?
Emulsified fertilizers, like the Central Garden Brands product, are liquid and easy to mix, but they may have a stronger fish odor. Hydrolyzed formulas, such as Neptune’s Harvest, retain proteins and oils, providing a broader spectrum of micronutrients and often a milder smell. Performance-wise, both deliver organic nitrogen, but hydrolyzed versions can improve soil microbiology more effectively.
Do I need to worry about the product’s price per ounce when comparing these fertilizers?
Price per ounce is a useful metric for value, especially when comparing bulk sizes like 1‑gallon versus 18‑ounce bottles. Higher‑concentration products may require less frequent application, potentially offsetting a higher upfront cost. Always calculate the total cost for the amount of fertilizer needed for your garden’s size to determine true value.
Are fish fertilizers safe for indoor plants and edible crops?
Yes, most fish fertilizers listed here are labeled safe for indoor use and certified organic, making them suitable for vegetables, herbs, and fruiting plants. Look for OMRI‑listed items, such as Alaska Fish Fertilizer, to ensure compliance with organic standards. Just follow dilution instructions to avoid leaf burn, especially on sensitive indoor foliage.
What benefits do added seaweed or kelp ingredients provide?
Seaweed and kelp introduce trace minerals, hormones, and natural growth promoters that complement the nitrogen from fish. Products like GS Plant Foods Liquid Fish & Kelp blend improve soil structure and boost nutrient uptake. This synergy often results in stronger root systems and more vibrant foliage.
How often should I apply fish fertilizer for optimal results?
Most liquid fish fertilizers are applied every 2–4 weeks, with a light feeding schedule during the growing season. Dilute according to the label—typically 1–2 tablespoons per gallon of water for garden beds, and a stronger mix for trees. Consistent, moderate applications prevent nutrient buildup and encourage steady growth.
Is the odor of fish fertilizer a deal‑breaker, and are there low‑odor options?
Traditional fish emulsions can have a strong smell, but deodorized formulas like Alaska’s 5‑1‑1 concentrate use natural wintergreen to mask the odor. Hydrolyzed products such as Neptune’s Harvest retain nutrients while minimizing scent. If odor is a concern, choose a deodorized or hydrolyzed option and apply it during cooler parts of the day.