Comparison: Best Liquid Fish Fertilizer For Tomatoes (Updated | Dec 1st)
But with so many liquid fish fertilizers on the market, how do you pick the best one? From organic blends to fast-acting nutrients, we’ll break down what really works—so you can skip the guesswork and give your tomatoes the powerhouse feeding they deserve. Let’s dive in.
- Best for omri certified: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for burn-free boost: Harris Organic Plant and Lawn Fertilizer
- Best for soy-enhanced yield: True Organic Liquid Tomato & Vegetable Food – Organic Fertilizer for Superior Harvests – 16 fl. oz. Bottle Covers 30 Sq. Ft.
- Best for vitamin-rich formula: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for high-yield emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for drought-resistant boost: Neptune’s Harvest Tomato & Veg Fertilizer 2-4-2
- Best for odorless cold-press: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for fish-kelp fusion: Down To Earth All Natural Fertilizers Organic Liquid Fish & Kelp Concentrate – Plant Food for Vegetable Gardens and Flower Beds – Makes up to 32 Gallons 2-4-1
- Best for balanced omri: GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens
- Best for wintergreen deodorized: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
Product Comparison: Best Liquid Fish Fertilizer For Tomatoes
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
Harris Organic Plant and Lawn Fertilizer, Hydrolyzed Liquid Fish Fertilizer Emulsion Great for Tomatoes and Vegetables, 3-3-0.3, 32oz (32oz (Quart))
- Uses trace minerals and micronutrients naturally derived from fish
- Promotes vigorous growth of plants and vegetables
- Great for all indoor and outdoor plants
- For use in an Organic Gardening program
- Won’t burn plants
True Organic Liquid Tomato & Vegetable Food – Organic Fertilizer for Superior Harvests – 16 fl. oz. Bottle Covers 30 Sq. Ft.
- Boosts Organic Yields: True Liquid Tomato & Vegetable Food promotes superior harvests of fruits and vegetables with a proven nutrient-rich formula.
- Innovative Soy Protein Hydrolysate: Contains an exclusive blend of ingredients, including Soy Protein Hydrolysate, to enhance plant and soil health naturally.
- Versatile Application: Ideal for in-ground and container plants, indoors and outdoors, providing balanced nourishment for thriving gardens.
- Easy-to-Use Formula: Simply mix 2 oz. per gallon of water and apply every two weeks during the growing season for optimal growth.
- Generous Coverage: One 16 fl. oz. bottle covers approximately 30 sq. ft. and the 32 fl. oz. bottle covers 60 sq. ft., making it perfect for small to medium gardens.
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
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 Tomato & Veg Fertilizer 2-4-2, 1 Gallon
- Helps Increases Vigor And Volume Of Tomatoes And Vegetables
- Ideal For Vegetables, Trees, Shrubs And Flowers
- Nutrients Help Plants Tolerate Drought
- Pet Safe
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
Down To Earth All Natural Fertilizers Organic Liquid Fish & Kelp Concentrate – Plant Food for Vegetable Gardens and Flower Beds – Makes up to 32 Gallons 2-4-1, 32 oz
- Fast‑acting liquid formula: Perfect for foliar feed or soil drench applications, supporting quick absorption and growth stimulation.
- Stimulates overall plant vigor: High phosphorus aids flowering and fruiting, while nitrogen supports lush foliage and root development.
- Organic & soil‑friendly: Helps promote beneficial microbial activity and sustainable soil health due to its fish and kelp base
- Versatile application rates: For general garden use: ¼–½ cup per gallon of water; for containers: 2–4 Tbsp per gallon; for houseplants: 2 Tbsp per gallon, repeated every 2–4 weeks depending on growth stage
- Watch out for odor: While extremely effective, many users report a strong fish-like odor characteristic of fish emulsions—though it typically subsides quickly and doesn’t linger long indoors
GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens, Lawns & Container Growing
- Organic Materials Review Institute Listed for Organic Production Approved as GS Plant Foods Organic Liquid Fish Concentrate 2-3-1. Suitable for organic growing under OMRI and NOP standards.
- Balanced Nutrient Formula (2-3-1) Provides primary nutrients from hydrolyzed fish for sustained plant nutrition and soil health.
- Versatile Garden Use: Ideal for vegetables, lawns, flowers, shrubs, trees, fruit, and container plants when used as directed.
- Simple Application: Mix 4 oz per gallon of water for most uses. Apply generously to soil or as a foliar feed until leaves are wet.
- Florida Licensed Manufacturer: Produced by GS Plant Foods, LLC (License F003717). 1 Gallon liquid fertilizer (8.9 lb).
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
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 nutrients should I look for in a liquid fish fertilizer for tomatoes?
Tomatoes thrive on a balanced supply of nitrogen, phosphorus, and potassium, typically expressed as an NPK ratio around 2-4-2 or 2-3-1. Look for products that also list micronutrients like calcium and magnesium, which support fruit set and prevent blossom end rot. Fish‑based fertilizers naturally contain these macro‑ and micronutrients, making them a good fit for tomato production.
How does the NPK ratio affect tomato growth and which ratios are best?
A lower nitrogen and higher phosphorus ratio (e.g., 2-4-2) encourages strong root development and fruiting, while a moderate nitrogen level (2-3-1) promotes steady foliage growth without excessive leafiness. For early season vegetative growth you may favor a slightly higher nitrogen, then switch to a higher phosphorus blend for fruit set. Both Neptune’s Harvest 2-4-2 and GS Plant Foods 2-3-1 fall within these optimal ranges.
Which of these products offers the best value per ounce for a home garden?
The 1‑gallon Organic Fish Emulsion (B09FZTPQJL) provides a high nutrient density at a low cost per ounce, especially when compared to the 115‑oz Alaska Fish Fertilizer (B0DQ2LNX35). The larger containers of Neptune’s Harvest Tomato & Veg Fertilizer (1 gallon) also deliver good coverage, but the 1‑gallon fish emulsion’s 2‑3‑1 ratio and comprehensive micronutrient profile give it a slight edge in overall value.
Are there odor differences among fish fertilizers and how can I manage them?
All true fish emulsions have a characteristic fishy smell, but products like Alaska Fish Emulsion (deodorized with natural wintergreen) and Neptune’s Harvest claim reduced odor. If odor is a concern, apply the fertilizer in the early morning or evening when the scent dissipates quickly, and consider diluting it as recommended to minimize the smell while still delivering nutrients.
How important is an OMRI listing for organic gardening?
An OMRI listing confirms that a product meets the strict standards for organic production, which is crucial for gardeners who sell certified organic produce or want to avoid synthetic inputs. Both Alaska Fish Fertilizer (B0DQ2LNX35) and GS Plant Foods Liquid Fish Fertilizer (B00LUT5E74) carry OMRI certification, giving them an advantage for growers who need compliance documentation.
What application rates are recommended for tomatoes with these fertilizers?
Most liquid fish fertilizers suggest mixing 2–4 oz per gallon of water and applying every two weeks during the growing season; True Organic Liquid Tomato & Vegetable Food (B08VF6HRF7) specifically recommends 2 oz per gallon. For larger garden beds, a 1‑gallon bucket diluted in 10–12 gallons of water provides even coverage, while container growers can use 2 Tbsp per gallon for a more concentrated feed.
How do added ingredients like kelp or soy protein hydrolysate influence results?
Kelp contributes natural plant hormones and micronutrients that boost stress tolerance and fruit quality, while soy protein hydrolysate offers an extra source of amino acids for improved root health. Products such as Down To Earth Fish & Kelp Concentrate and True Organic Liquid Tomato & Vegetable Food include these additives, which can lead to faster growth and higher yields compared to plain fish emulsion.
Which product is most suitable for container tomatoes versus in‑ground planting?
For containers, a lighter, fast‑acting formula like Down To Earth Fish & Kelp Concentrate (B07W81C9T8) works well because it can be applied as a foliar feed without over‑watering the limited soil volume. In‑ground tomato beds benefit from the higher nutrient load of a 1‑gallon fish emulsion (B09FZTPQJL) or Neptune’s Harvest Tomato & Veg Fertilizer (B01CI33HUG), which provide sustained feeding through soil drenching.