Comparison: Best Fish Fertilizer Garden (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, which one really delivers? We’ve dug into the best fish fertilizers on the market, testing for nutrient content, ease of use, and real garden results. Whether you’re growing veggies, flowers, or lush greens, the right fish fertilizer can make all the difference.
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
Sustainable Yield Booster
- 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 sustainable yield booster: 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 power: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for seaweed flower enhancer: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for kelp-boosted soil: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for balanced bio-fish: Down To Earth All Natural Fertilizers Organic Bio-Fish – Plant Food for Corn
- Best for early-season nitrogen: Fish Meal – Organic Fish Fertilizer 8-6-0 (5 lbs)
- Best for mini seaweed boost: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
Product Comparison: Best Fish Fertilizer 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
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
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.
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!
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
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 consider when choosing a fish fertilizer for my garden?
Look at the NPK ratio to match your plants’ growth stage, the concentration (liquid vs. granular), and any certifications such as OMRI for organic use. Also compare the size of the container and price per ounce to gauge value, and check for added ingredients like kelp or seaweed that can boost micronutrients.
How does a liquid fish emulsion differ from a dry fish meal fertilizer?
Liquid emulsions, like the Central Garden Brands or Neptune’s Harvest liquids, are fast‑acting and can be applied as a soil drench or foliar spray for quick nutrient uptake. Dry fish meal, such as the 5‑lb Fish Meal 8‑6‑0, releases nutrients more slowly, making it ideal for long‑term soil building and early‑season feeding.
Which product offers the best value for a large vegetable garden?
The 1‑gallon Organic Fish Emulsion (2‑3‑1 NPK) provides a high volume at a low cost per gallon and includes a balanced ratio for frequent applications. Its cold‑pressed, 100 % fish content ensures maximum nutrient retention, making it a cost‑effective choice for extensive beds.
Do any of these fertilizers have a reduced fishy odor?
Neptune’s Harvest Fish Fertilizer (both 18 oz and 36 oz) uses a unique cold‑process that retains proteins and oils while minimizing odor, unlike many traditional emulsions that smell strongly. The GS Plant Foods Liquid Fish & Kelp blend also reports a milder scent due to the added seaweed component.
Is it important that a fertilizer is OMRI listed?
Yes, OMRI listing confirms the product meets strict organic standards, which is essential if you garden organically or have an organic certification. Products like Alaska Fish Fertilizer, Down To Earth Bio‑Fish, and GS Plant Foods all carry OMRI approval.
Can I use the same fish fertilizer on indoor houseplants as on outdoor gardens?
Most of the listed products, such as Central Garden Brands and Alaska Fish Fertilizer, are formulated for both indoor and outdoor use, but be sure to dilute according to the label to avoid over‑feeding. Indoor plants benefit from the gentle nutrient release of low‑strength applications.
What are the benefits of adding seaweed or kelp to a fish fertilizer?
Seaweed or kelp, found in GS Plant Foods and Neptune’s Harvest Seaweed blends, supply trace minerals, hormones, and vitamins that enhance root development and stress tolerance. This combination improves soil microbiology and can lead to larger, more vibrant blooms and fruit sets.
How do I compare the cost efficiency of these products?
Calculate the price per ounce or per pound and factor in the recommended application rate; a higher NPK ratio may require less product per use. For example, the 1‑gallon organic emulsion offers a lower cost per nutrient unit than the smaller 18‑oz bottles, while the bulk 5‑lb fish meal provides the best price for long‑term soil amendment.