Comparison: Best Fish Fertilizer For Garden (Updated | Dec 1st)
But with so many options out there, how do you know which one’s truly the best? We’ve dug into the top contenders, testing for effectiveness, ease of use, and value, so you can skip the guesswork and give your plants the nourishment they deserve. Let’s find your garden’s perfect match.
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
Sustainably Sourced Emulsion
- 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 sustainably sourced 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 compact odorless formula: Neptune’s Harvest Fish Fertilizer 2-4-1
- 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 bloom enhancer: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for all‑purpose liquid: Fish & Seaweed Fertilizer (2-3-1) | All Purpose Liquid Plant Food for Indoor Plants & Outdoor Garden
- Best for balanced 7‑7‑2 boost: Down To Earth All Natural Fertilizers Organic Bio-Fish – Plant Food for Corn
- Best for bulk nitrogen surge: Fish Meal – Organic Fish Fertilizer 8-6-0 (5 lbs)
Product Comparison: Best Fish Fertilizer For Garden
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!
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
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 (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
Fish & Seaweed Fertilizer (2-3-1) | All Purpose Liquid Plant Food for Indoor Plants & Outdoor Garden, Vegetables & Flowers | All-Natural Fish & Seaweed Formula Potted Plants & Garden Flowers (8 oz)
- ALL-PURPOSE PLANT FOOD FOR GARDEN & HOME: One versatile solution! Ideal liquid fertilizer for vegetables promoting yield, powerful flower fertilizer for vibrant blooms, effective indoor plants fertilizer, and general garden fertilizer for trees, shrubs, and containers.
Down To Earth All Natural Fertilizers Organic Bio-Fish – Plant Food for Corn, Broccoli, Kale, Trees and Shrubs 7-7-2, 5 lb
- Balanced NPK Formula (7-7-2): Provides equal parts nitrogen and phosphorus for robust vegetative growth and root development, plus potassium for improved resilience and bloom support.
- Marine-Based Fertility Boost: Made with fish meal and fish bone meal—ideal for improving soil biology and long-term fertility.
- OMRI Listed for Organic Use: Safe and approved for certified organic farming and gardening systems.
- Feeds Soil & Plants Naturally: Encourages beneficial microbial activity, resulting in better nutrient absorption and stronger plants.
- Great for Vegetables, Fruits & Flowers: Versatile enough for raised beds, garden rows, containers, and landscape use.
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!
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 factors should I consider when choosing a fish fertilizer for my garden?
Look at the NPK ratio, organic certifications, and odor level to match your plant needs and personal preferences. Check the concentration and package size to estimate how often you’ll need to apply it. Also consider whether the formula includes added seaweed or micronutrients for extra soil health.
How does the nutrient ratio (NPK) differ among the listed fish fertilizers, and why does it matter?
Products range from a balanced 2‑3‑1 ratio (e.g., GS Plant Foods, Fish & Seaweed blends) to a higher nitrogen 7‑7‑2 mix (Down To Earth Bio‑Fish) and a 2‑4‑1 ratio (Neptune’s Harvest). A higher nitrogen ratio promotes leafy growth, while more phosphorus supports flowering and root development. Choose the ratio that aligns with the growth stage of your plants.
Which product offers the best value for large garden applications?
The 1‑gallon Organic Fish Emulsion (B09FZTPQJL) provides a high volume of nutrient‑rich fertilizer at a lower cost per ounce than smaller quart or 18‑ounce bottles. Its 2‑3‑1 NPK is versatile for vegetables, flowers, and lawns, making it a cost‑effective all‑purpose choice for extensive beds.
Are there any fish fertilizers that are odor‑free or low‑odor?
Neptune’s Harvest formulas (both 36 oz and 18 oz) are processed with a cold‑press method that retains fish proteins but eliminates the strong fish smell common to emulsions. Similarly, the Central Garden Brands Fish Emul Fertilizer advertises a burn‑free, low‑odor application, making them good options for indoor or close‑quarter use.
How do organic certifications like OMRI impact my choice?
OMRI‑listed products, such as Alaska Fish Fertilizer and GS Plant Foods, are approved for use in certified organic gardening, ensuring they meet strict standards for natural ingredients. This can be important if you are growing food for a certified organic market or simply want assurance of minimal synthetic additives.
What are the benefits of adding seaweed or kelp to a fish fertilizer?
Seaweed and kelp contribute trace minerals, hormones, and natural growth stimulants that improve root development and stress tolerance. Products like GS Plant Foods Liquid Fish & Kelp blend combine fish nutrients with marine algae, enhancing soil microbiology and nutrient uptake for stronger, more resilient plants.
How do the concentrations (e.g., gallon vs quart) affect application frequency and cost?
Higher‑volume containers, such as the 1‑gallon fish emulsion, allow for more dilute mixes, reducing the frequency of refilling your sprayer and often lowering the price per unit of fertilizer. Smaller packages like the 1‑quart Central Garden Brands are convenient for trial use but may require more frequent purchases if you have a large garden.
Which fish fertilizer is most suitable for indoor plants versus outdoor use?
For indoor plants, low‑odor options like Neptune’s Harvest 2‑4‑1 or the Central Garden Brands 100099247 work well because they won’t overwhelm indoor spaces with a fishy scent. Outdoor gardeners may prefer the higher‑volume, nutrient‑dense 1‑gallon Organic Fish Emulsion or the seaweed‑enhanced GS Plant Foods for broader soil health benefits.