Comparison: Best Neptune Fish Emulsion Fertilizer (Updated | Dec 1st)
If your garden’s been craving a natural boost, you’ve probably heard about Neptune Fish Emulsion Fertilizer. But with so many options out there, how do you know which one delivers the best results? We’ve dug into the details, tested the formulas, and compared the pros and cons so you don’t have to. Whether you’re growing lush tomatoes or vibrant flowers, the right fish emulsion can make all the difference. Let’s break down what sets the top contenders apart and help you choose the perfect fit for your thriving garden.
- Best for odor-free boost: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for chelated boost: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for bloom boost blend: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for mini odor-free: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for seaweed bloom boost: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for garden scale bloom: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)
- Best for pungent powerhouse: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for omri certified boost: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for wintergreen deodorized: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for root strength formula: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
Product Comparison: Best Neptune Fish Emulsion Fertilizer
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 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
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
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!
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
Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Develops deep green foliage, vigorous root systems and a solid plant structure
- Derived from fish soluble, can be used from indoor and outdoor. Can be used on plants and trees.
- Mixes with water and can be used by any convenient method of application. Shake well before use.
- 5-1-1 Fertilizer contains 5% Nitrogen, 1% Phosphate and 1% Soluble Potash.
- For plants mix 1-2 tbsp per 1 gal of water. For trees mix 4 tbsp per gal of water.
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 is the key difference between the 2‑4‑1 and 2‑3‑1 Neptune’s Harvest formulas?
The 2‑4‑1 blend has a higher nitrogen content, which promotes vigorous leaf and stem growth, making it ideal for leafy vegetables and fast‑growing plants. The 2‑3‑1 formula contains slightly less nitrogen and more phosphorus, encouraging stronger root development and abundant flowering, which is great for fruiting crops and ornamental blooms.
How does Neptune’s cold‑process manufacturing affect nutrient quality compared to regular fish emulsions?
The cold‑process preserves vitamins, amino acids, enzymes, and growth hormones that can be destroyed by heat, resulting in a more biologically active fertilizer. It also retains fish proteins and oils, providing a slow‑release source of nutrients and eliminating the strong fish odor typical of many emulsions.
Which package size gives the best value for a home gardener?
Generally, the gallon containers (e.g., the 1‑gallon 2‑4‑1 or 2‑3‑1 blends) offer the lowest cost per ounce and are convenient for regular, large‑area applications. For small‑scale projects or trial runs, the 18‑ounce bottles are affordable and easy to store, though the per‑ounce price is higher.
Do any of these fertilizers have an unpleasant smell?
Neptune’s Harvest products are formulated to retain fish proteins and oils while eliminating the typical fishy odor, thanks to the cold‑process technique. In contrast, the generic 1‑gallon organic fish emulsion from other brands does emit a noticeable fish smell, which some gardeners find off‑putting.
How do Neptune’s Harvest fertilizers compare to Alaska Fish Fertilizer and Fertilome in terms of NPK ratios and organic certification?
Neptune’s Harvest offers a 2‑4‑1 or 2‑3‑1 ratio, focusing on balanced growth and flowering, whereas Alaska Fish Fertilizer and Fertilome provide a 5‑1‑1 ratio that is higher in nitrogen for rapid foliage development. All three are OMRI‑listed and suitable for organic gardening, but Neptune’s products also include seaweed additives for added micronutrients.
Can the fish‑and‑seaweed blends be used for both vegetables and ornamental plants?
Yes, the 2‑3‑1 fish & seaweed formulas are designed to enhance vegetable yields, strengthen flower color, and improve overall plant vigor. Their micronutrient profile supports a wide range of species, making them a versatile choice for mixed gardens.
What are the recommended application methods for these fertilizers?
All Neptune’s Harvest products can be mixed with water and applied by hand, sprayer, or drip line, allowing flexibility for beds, containers, or hydroponic systems. Follow the label directions—typically 1‑2 tablespoons per gallon of water for foliage, and a higher concentration for trees or large shrubs.
Is the chelated nitrogen in the gallon version more effective than standard fish emulsion?
Chelated nitrogen is bound to organic molecules, which makes it more readily available for plant uptake and reduces the risk of nitrogen lock‑out. This technology gives the gallon‑size Neptune’s Harvest a slight edge in efficiency over non‑chelated fish emulsions.
Are there any special storage or safety tips I should follow?
Store all liquid fertilizers in a cool, dark place and keep the lids tightly sealed to maintain potency and prevent spills. Because these products are organic, they are low‑toxicity, but it’s still advisable to wear gloves during mixing and avoid direct contact with eyes or open wounds.