Comparison: Best Fish And Seaweed Emulsion (Updated | Dec 1st)
If your garden’s craving a natural boost, you’ve probably heard buzz about fish and seaweed emulsion. But with so many options out there, how do you know which one delivers real results? Whether you’re growing tomatoes, flowers, or leafy greens, the right emulsion can make all the difference.
- Best for compact 18oz boost: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for value 36oz pack: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (36 Ounce)
- Best for wintergreen odorless: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for cold-pressed purity: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for gallon garden power: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)
- Best for salmon nutrient blend: Fish Emulsion Fertilizer
- Best for deep green formula: Fertilome (10611) Fish Emulsion Fertilizer 5-1-1 (16 oz)
- Best for low-odor powder: Fish Emulsion Fertilizer 12-2-2 Powder (3.3 pounds Powder-Up to 300 Gallons of Water)
- Best for omri certified blend: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
Product Comparison: Best Fish And Seaweed Emulsion
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
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
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 (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
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
Fertilome (10611) Fish Emulsion Fertilizer 5-1-1 (16 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.
Fish Emulsion Fertilizer 12-2-2 Powder (3.3 pounds Powder-Up to 300 Gallons of Water), for Vegetables, Trees, Lawns, Shrubs, Flowers, Fruits
- Organic Fish Protein :12-2-2 NPK powder made from 100% fish dried liquid powder, ground, and highly water-soluble when mixed.
- 2× Super Concentrated Powder: 1 lb (≈450 g) makes up to 100 gal of liquid feed,ideal for both large veggie plots and indoor/hydro gardens, creating high-value yield.
- Proven Results and Trusted Organic Fertilizer: Comparison experient conducted on same seed, same soil. The fertilizer supports visible growth and robust fruit set.
- Promotes Healthier Roots & Foliage: Rich in natural amino acids and micronutrients, boosts plant stress resistance, soil biology, and nutrient uptake.
- Reduced Odor, Easy to Use: Dry powder form alleviates the strong “fishy” smell of traditional emulsions. Simple to store, measure, and apply; mix and water every 1–2 weeks.
- Sustainable & Responsibly Sourced: Made in small batches from by products of the fish meal industry, organically biodegradable with minimal waste.
- Includes a teaspoon for ease of measurement
Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables, Trees, Lawns, Shrubs, Flowers, Seeds & Plants – Hydrolyzed Fish and Seaweed Blend
- OMRI ORGANIC LISTED FISH AND SEAWEED BLEND: GS Plant Foods all-natural liquid fish is a high quality organic product that gives excellent plant growth, rebuilds soil, and offers higher production yields. Kelp is often applied to any type of plants, trees, lawns, flowers, vegetables and seeds without concern for harmful runoff.
- OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, liquid seaweed fertilizer acts as an efficacious growth promoter. GS Plant Foods fish seaweed fertilizer is used extensively on a commercial basis, as well as at home for gardeners as an organic soil conditioner. This fish fertilizer for vegetables will lead to healthier crop yields and general plant well being.
- EASY TO APPLY FOR NATURAL GREAT RESULTS: Apply liquid fish & kelp fertilizer to improve specific growth stages. For House Plants; use 1 tablespoon per gallon of water. Feed every two weeks and do not over water. For Outdoor Plants; Use 2 fl. Oz per gallon of water. Feed vegetables, flowers, trees and shrubs every 2-3 weeks. Apply until soil is saturated or as a foliar feed until leaves are wet, top and bottom. For Lawns; use 2 to 4 oz concentrate per gallon of water to cover 1,000 sq. ft.
- TRUSTED & RELIABLE: At GS Plant Foods, we understand that you are placing your trust in us to provide you with the highest quality products available. We have 100% confidence in the quality of our products and continuously strive to deliver the best customer experience. Our products are organic, easy to use, cost efficient, sustainable, and yield consistent & amazing results in your garden, no matter what you’re growing or what medium in which your plants are growing.
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 should I consider when choosing between liquid fish emulsion and powdered fish fertilizer?
Liquid emulsions like Neptune’s Harvest or GS Plant Foods are ready‑to‑mix and work quickly, but they can have a strong fish odor and require more storage space. Powdered options such as the 12‑2‑2 fish protein powder reduce odor and are easier to store, yet they need to be dissolved in water before use. Think about your preferred application method, storage constraints, and tolerance for scent when deciding.
How do the NPK ratios differ among the listed products, and why does that matter?
Most products use a 2‑3‑1 or 5‑1‑1 ratio, providing balanced nitrogen for leaf growth and moderate phosphorus and potassium for root development. The 12‑2‑2 powder offers a higher nitrogen boost, ideal for rapid vegetative growth, while the 2‑3‑1 formulations are gentler for frequent feeding. Choose a ratio that matches the growth stage of your plants—higher nitrogen for seedlings, lower for flowering or fruiting stages.
Is there a noticeable price‑per‑ounce advantage in buying larger containers?
Generally, the 36‑ounce and gallon sizes of Neptune’s Harvest and GS Plant Foods deliver a lower cost per ounce compared with the 18‑ounce bottles. The 1‑gallon Alaska Fish Emulsion and the 1‑gallon organic fish emulsion also provide better value for high‑volume gardeners. Compare the total price and calculate the cost per ounce to ensure you’re getting the best deal for your budget.
Which products are certified organic, and does that affect performance?
GS Plant Foods’ fish & kelp blend is OMRI‑listed organic, and the 1‑gallon organic fish emulsion advertises a fully organic formulation. While organic certifications guarantee no synthetic chemicals, performance is comparable to non‑organic emulsions if applied correctly. If organic certification is important to you, these options meet that requirement without sacrificing nutrient quality.
How does odor influence my choice of fish fertilizer?
Traditional liquid emulsions, such as Neptune’s Harvest and Alaska Fish Emulsion, emit a strong fishy smell that some gardeners find unpleasant. The 12‑2‑2 powder and the deodorized Alaska concentrate are formulated to minimize odor, making them suitable for indoor or close‑quarter use. If scent is a concern, opt for low‑odor or powdered formulations.
What are the best application methods for these fertilizers?
All liquid products can be mixed with water and applied via hand watering, sprayer, or drip line, offering flexibility for both indoor and outdoor gardens. Powdered fertilizers require dissolution in water before use, but they can be measured precisely for large plots. Follow each label’s recommended dilution rates—typically 1‑2 Tbsp per gallon for foliage and higher rates for trees—to avoid over‑feeding.
Do any of these fertilizers provide additional benefits beyond basic nutrition?
The GS Plant Foods blend includes kelp, which supplies natural hormones that promote root growth and stress resistance. The 12‑2‑2 powder highlights micronutrients and amino acids that enhance soil biology and improve fruit set. Some products, like the organic fish emulsion, claim to boost beneficial microorganisms, adding a soil‑health advantage beyond NPK values.
How do I determine the best value for my garden’s size and plant types?
Calculate the total gallons of water you’ll treat each season and match that to the fertilizer’s dilution guidelines. Larger containers (gallon or 36‑ounce) are more economical for extensive beds, while smaller 8‑oz bottles suit container gardeners or limited‑space growers. Consider the specific needs of your plants—vegetables often benefit from higher nitrogen, whereas flowering plants thrive with balanced 2‑3‑1 blends.