Comparison: Best Bonide Fish Fertilizer (Updated | Dec 1st)
If you’ve ever wondered how some gardeners get their tomatoes so plump or their roses so vibrant, the secret might just be in the soil—and specifically, in a bottle of Bonide fish fertilizer. With several options on the market, it’s easy to feel overwhelmed. We’ve tested and compared the top Bonide fish fertilizers to help you cut through the noise.
- Best for vitamin-rich boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for omri certified: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for wintergreen fresh: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for salmon nutrient power: Fish Emulsion Fertilizer
- Best for odorless cold-press: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for premium cold-press: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for bloom-boost seaweed: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for sustainable soil drip: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for large bloom booster: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for root-boost bone: Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds
Product Comparison: Best Bonide 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
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 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 & 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 & 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
Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds, Bulbs, Blooms, Flower Beds 4-12-0, 5 lb
- Water-Soluble Formula – Easily dissolves in water for quick absorption and efficient nutrient delivery directly to the root zone
- Targets Root Development – Formulated to enhance root growth, improving plant stability, nutrient uptake, and drought resistance
- Fast-Acting Nutrients – Provides immediate access to essential nutrients like nitrogen, phosphorus, and potassium where roots need them most.
- Ideal for Transplants & Seedlings – Great for jumpstarting young plants or helping transplants establish quickly in new soil.
- Improves Soil-Root Interaction – Encourages a healthy rhizosphere, boosting microbial activity and root-zone nutrient cycling.
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 look for in a fish fertilizer?
Most fish emulsions offer a balanced 2-3-1 or 5-1-1 ratio, which provides ample nitrogen for foliage growth and enough phosphorus for root development. If you prioritize leaf growth, a higher nitrogen ratio like 5-1-1 (e.g., Alaska Fish Emulsion) can be beneficial. For a more balanced approach suitable for vegetables and flowers, the 2-3-1 formula found in Neptune’s Harvest works well.
How do the odor levels compare between these fish fertilizers?
Traditional fish emulsions can have a noticeable fishy smell, especially the larger 1‑gallon concentrate from the generic brand. Neptune’s Harvest products use a cold‑process that retains nutrients while minimizing odor, making them more pleasant for indoor use. The deodorized Alaska Fish Emulsion adds natural wintergreen to further reduce the scent.
Which product offers the best value per ounce?
When evaluating cost per ounce, the 1‑gallon Alaska Fish Fertilizer (5‑1‑1) provides the lowest price per unit of nutrient, ideal for large gardens. The 36‑ounce Neptune’s Harvest 2‑4‑1 also offers good value with a higher nutrient density and longer shelf life. For small‑scale indoor growers, the 8‑oz Complete Fish Emulsion is affordable but less economical on a per‑ounce basis.
Are any of these fertilizers certified organic or OMRI listed?
Yes, the Alaska Fish Fertilizer (115 oz) is OMRI listed, confirming its suitability for organic certification programs. Neptune’s Harvest products are marketed as 100 % organic and use a cold‑process to preserve natural compounds. The Central Garden Brands fish emulsion also claims to be 100 % organic, making all three viable for organic gardening.
Which fertilizer is safest for use on indoor houseplants?
Indoor growers should favor low‑odor, non‑burning formulas such as the deodorized Alaska Fish Emulsion or the 8‑oz Complete Fish Emulsion, both of which are designed to be gentle on foliage. Neptune’s Harvest 2‑4‑1, while odor‑free, is slightly more concentrated and may require careful dilution. Always start with a weak solution and observe plant response before increasing strength.
How do the micronutrient contents differ among these products?
Neptune’s Harvest emphasizes a full spectrum of micro and macro nutrients retained through its cold‑process, delivering amino acids, enzymes, and hormones. Alaska’s 5‑1‑1 formulas provide essential micronutrients but focus primarily on the primary NPK values. The Central Garden Brands emulsion highlights 11 vitamins, offering a broader range of micronutrients for overall plant health.
Can I use these fish fertilizers on both vegetables and ornamental plants?
Absolutely. All listed products are formulated for universal use, covering vegetables, fruits, flowers, and ornamental shrubs. For high‑yield vegetable production, the higher nitrogen 5‑1‑1 blends from Alaska are advantageous, while the balanced 2‑3‑1 or 2‑4‑1 blends from Neptune’s Harvest enhance bloom quality in ornamental plants.
What are the key factors to consider when choosing a container size?
Container size impacts storage, shelf life, and application frequency. Larger containers like the 1‑gallon options are cost‑effective for extensive gardens but require proper sealing to prevent spoilage. Smaller bottles (8‑oz or 18‑oz) are convenient for occasional use, indoor gardening, or trial periods, reducing waste if you’re unsure about long‑term needs.