Comparison: Best Neptune Harvest Fish Emulsion (Updated | Jan 15th)
If you’re looking to give your garden a natural boost, fish emulsion is a go-to choice—and Neptune’s Harvest stands out in a crowded field. But with several formulas to pick from, how do you know which one’s best for your tomatoes, roses, or leafy greens? We’ve dug into the details, tested results, and compared nutrient profiles to help you decide.
- Best for odorless protein boost: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for chelated nutrient power: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for bloom boost blend: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for vibrant garden blend: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for full-scale bloom: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)
- Best for compact odorless boost: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for fs136 blend strength: Neptune’s Harvest FS136 32 Oz. Fish & Seaweed Blend Fertilizer 2-3-1
- Best for enzyme rich soil: Neptune’s Harvest Organic Fish Fertilizer 36-Oz Bottle
- Best for hydrolyzed nutrient extract: Neptune’s Harvest Hydrolyzed Fish Fertilizer
- Best for tomato vigor formula: Neptune’s Harvest Tomato & Veg Fertilizer 2-4-2
Product Comparison: Best Neptune Harvest Fish Emulsion
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, Gallon
- An organic fertilizer made from fresh North Atlantic fish
- Made by a unique cold process that protects the vitamins, amino acids, enzymes and growth hormones
- Contains all the micro and macro nutrients naturally found in fish
- The nitrogen and other nutrients are chelated, so they are readily available for plants consumption
- The fish proteins and oils are retained and the fertilizer 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
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
Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)
- 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
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 FS136 32 Oz. Fish & Seaweed Blend Fertilizer 2-3-1
- Fish & Seaweed Blend
Neptune’s Harvest Organic Fish Fertilizer 36-Oz Bottle
- Organic, highly nutritional protein fertilizer made with naturally occurring enzymes present in fresh north atlantic fish
- Nitrogen, derived from fish protein in the form of amino acids, slowly breaks down into basic compounds when added to soil
- Does no biological damage to the soil and will promote the growth of beneficial bacteria
- Because no oils or proteins are removed, the nutrients remain in the soil longer
- Pack of 1
Neptune’s Harvest Hydrolyzed Fish Fertilizer
- Sold on Amazon
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
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 are the main differences between the 2‑4‑1 fish fertilizer sizes (18 oz, 36 oz, and gallon)?
The 18 oz and 36 oz bottles are convenient for small‑scale gardeners or indoor containers, while the gallon provides better value for larger beds or multiple beds. All three use the same cold‑processed fish formula, so nutrient ratios and odor‑free performance are identical. Choose the size that matches the volume of soil you need to treat and your storage space.
How does the 2‑3‑1 Fish & Seaweed blend differ from the pure 2‑4‑1 fish fertilizer?
The 2‑3‑1 blend adds seaweed, which contributes additional micronutrients, hormones, and a higher potassium level for stronger blooms and foliage. The pure 2‑4‑1 formula focuses on higher nitrogen for vegetative growth, making it ideal for leafy crops. If you want a balanced boost for both growth and flowering, the 2‑3‑1 blend is the better choice.
Is there any odor with Neptune’s Harvest fish fertilizers, and why does it matter?
No, Neptune’s Harvest uses a unique cold‑process that retains fish proteins and oils while eliminating the typical fishy smell. This makes the product pleasant to handle and safe for indoor or close‑quarter use. The lack of odor does not affect the nutrient content, so you get full performance without the nuisance.
Which product offers the best value per ounce for a home gardener?
The gallon containers of both the 2‑4‑1 fish fertilizer and the 2‑3‑1 fish‑seaweed blend provide the lowest cost per ounce, typically saving 30‑40 % compared with the smaller bottles. Because the nutrients are chelated and slowly released, the larger volume also reduces the frequency of applications. For most gardeners, buying a gallon is the most economical option.
Can I use the fish fertilizer on both vegetables and ornamental plants?
Yes, the 2‑4‑1 formula is excellent for leafy vegetables, tomatoes, and fruiting crops, while the 2‑3‑1 blend enhances flower color and bloom longevity on ornamental plants. Both formulas are organic, pet‑safe, and support beneficial soil microbes, making them versatile for a mixed garden. Adjust the application rate according to the plant’s growth stage for optimal results.
What makes Neptune’s Harvest “organic” compared to regular fish emulsions?
Neptune’s Harvest is processed at low temperatures, preserving natural enzymes, amino acids, and hormones, and it retains all fish proteins and oils. Unlike standard emulsions that strip oils and add synthetic additives, this product remains fully natural and complies with USDA organic standards. The organic label assures you that no synthetic chemicals are introduced into your soil.
How should I apply the fertilizer for best results – by hand, sprayer, or drip line?
All Neptune’s Harvest formulas are water‑soluble, so you can mix them into irrigation water, apply with a hand‑held sprayer, or add to a drip‑line system. For large garden beds, a drip system provides consistent, low‑dose feeding. For container plants, a quick hand‑mix into the potting mix works well, ensuring even distribution.
Is there any advantage to choosing the “Tomato & Veg” 2‑4‑2 fertilizer over the standard 2‑4‑1?
The 2‑4‑2 formula adds extra potassium, which helps fruit set and improves drought tolerance in tomatoes and other fruiting vegetables. It also includes pet‑safe ingredients and is formulated specifically for higher‑yield crops. If your primary focus is on tomatoes, peppers, or cucumbers, the 2‑4‑2 may give a modest edge in fruit quality and size.