Comparison: Best Amazon Fish Fertilizer (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, you’ve probably heard about fish fertilizer—and for good reason. Packed with nutrients and easy to use, it’s a favorite among both beginner and seasoned gardeners. But with so many options on Amazon, how do you know which one’s truly the best?
- Best for organic 5-1-1: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for wintergreen fresh: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for seaweed power: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for sustainable yield: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for odorless protein: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for kelp soil boost: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for salmon strength: Fish Emulsion Fertilizer
- Best for compact odorless: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for garden color boost: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
Product Comparison: Best Amazon 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
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 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 & 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
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
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.
Fish Emulsion Fertilizer, Complete Fish Emulsion Plant Food, 8 oz (250mL)
- Complete fish fertilizer for thriving plants
- Helps growth with natural harvest salmon nutrients
- Easy-to-follow care instructions included
- Made in the USA
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
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 pick for vegetables versus flowering plants?
For veg‑growing, a lower nitrogen blend like 2‑3‑1 (Neptune’s Harvest 2‑3‑1 or the 1‑gallon organic fish emulsion) encourages steady leaf and fruit development. Flower lovers often prefer a higher nitrogen ratio such as 5‑1‑1 (Alaska Fish Fertilizer) to boost bloom size and color. Match the ratio to your plant’s growth stage: higher N for vegetative growth, higher P and K for flowering and fruiting.
Why does an OMRI listing matter when buying fish fertilizer?
OMRI (Organic Materials Review Institute) certification guarantees the product meets strict organic standards, so it can be used in certified organic gardens. Both Alaska Fish Fertilizer (ASIN B0DQ2LNX35) and GS Plant Foods Liquid Fish & Kelp (ASIN B00BBLMXVQ) carry this label, giving peace of mind that no prohibited synthetic chemicals are present.
Do fish fertilizers really smell, and should I avoid the smelly ones?
All true fish emulsions have a natural fishy odor because they contain real fish proteins; the 1‑gallon organic fish emulsion (ASIN B09FZTPQJL) advertises its pungent scent as a sign of authenticity. Some brands, like Neptune’s Harvest 2‑4‑1 (ASIN B0012Q2TFA), use a cold‑process that locks in nutrients while minimizing odor, making them more pleasant for indoor use.
Which product gives the best value per ounce?
The Alaska Fish Emulsion Concentrate (1 gallon, ASIN B002RH0B26) provides a large volume at a low cost per ounce and includes a 5‑1‑1 NPK ratio, making it economical for big gardens. For smaller budgets, the 8 oz Fish Emulsion (ASIN B0DQR1X69R) is inexpensive but offers less total product, so compare the price‑per‑ounce on Amazon to decide.
Can I use these fertilizers as a foliar spray or only as a soil drench?
Most liquid fish fertilizers are versatile; the 2‑3‑1 1‑gallon emulsion (ASIN B09FZTPQJL) is formulated for both soil drenching and foliar applications. GS Plant Foods Liquid Fish & Kelp (ASIN B00BBLMXVQ) recommends mixing 2 oz per gallon of water for either method, while the concentrated 5‑1‑1 Alaska product (ASIN B0DQ2LNX35) works best diluted as a soil drench.
How do fish‑and‑kelp blends compare to pure fish emulsions?
Fish‑and‑kelp blends, like GS Plant Foods (ASIN B00BBLMXVQ), add trace minerals and seaweed hormones that improve soil microbiology and nutrient uptake. Pure fish emulsions, such as Central Garden Brands (ASIN B000BX4QGK), focus on delivering high nitrogen and protein content for rapid vegetative growth. Choose a blend if you want a broader spectrum of micronutrients; stick with pure fish for a quick nitrogen boost.
Is there a risk of burning my plants with these products?
Fish fertilizers are generally low‑risk for burn because they contain organic nitrogen that releases slowly; products like Central Garden Brands and Alaska Fish Fertilizer explicitly state they will not burn. However, over‑application or using undiluted concentrate can still cause leaf scorch, so always follow the label’s dilution instructions.
Do these fertilizers support beneficial soil microbes?
Yes, many fish emulsions include microorganisms or act as food sources for them; Central Garden Brands highlights stimulation of soil microbes, and Neptune’s Harvest emphasizes retained fish proteins that feed beneficial fungi. Adding a fish‑based fertilizer can improve soil structure and nutrient cycling, especially when paired with organic matter.