Comparison: Best Liquid Kelp And Fish Emulsion (Updated | Dec 1st)
If your garden could talk, it’d probably be begging for a nutrient boost—enter liquid kelp and fish emulsion, two powerhouse organic fertilizers beloved by gardeners everywhere. But which one truly delivers the lushest leaves, strongest roots, and most vibrant blooms? We’ve dug into the science, tested real results, and compared the pros and cons so you don’t have to. Whether you’re growing tomatoes, roses, or lush greens, let’s find out which liquid gold deserves a spot in your watering can.
- Best for sea soil boost: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for rapid growth boost: 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 cold-pressed power: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for kelp-fish fusion: Organic Fish Emulsion with Kelp
- Best for pro-grade fertilizer: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for quart fish boost: EB Stone Fish Emulsion with Kelp
- Best for amino-rich formula: Indian River Organics Fish & Kelp Blend Fertilizer – OMRI Listed Organic Fertilizer (36 oz) 1 Quart- Liquid Organic Fish and Kelp for Turf
- Best for clean kelp: Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement
- Best for fulvic power: Fish Emulsion with Kelp & Fulvic Acid
- Best for bulk kelp boost: Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement (128 oz) Concentrated Makes 750 Gallons
Product Comparison: Best Liquid Kelp And Fish Emulsion
GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens, Lawns, and Vegetables
- ORGANIC MATERIALS REVIEW INSTITUTE LISTED FOR TRUSTED GARDEN CARE Certified by OMRI for use in organic growing, GS Plant Foods Liquid Fish & Kelp Fertilizer delivers reliable, natural nutrition for vegetables, lawns, flowers, and shrubs.
- SEA-AND-SOIL BASED NUTRITION Made from North Atlantic seaweed (Ascophyllum nodosum) and fresh fish hydrolysate, this liquid concentrate provides essential nutrients and trace minerals that help support healthy soil and plant development.
- IMPROVES SOIL MICROBIOLOGY & NUTRIENT UPTAKE Supports a thriving soil ecosystem that promotes strong root systems and efficient nutrient absorption — the foundation for resilient, productive plants.
- EASY-TO-USE CONCENTRATE FOR ALL PLANTS Mix 2 oz per gallon of water and apply as a foliar spray or soil drench every 2–4 weeks. Safe for use on vegetables, fruits, ornamentals, turf, and houseplants.
- MADE IN THE USA – SUSTAINABLY PRODUCED Proudly produced by GS Plant Foods as a licensed fertilizer manufacturer. No synthetic chemicals, additives, or fillers — just natural ingredients formulated for healthy home gardens and hobby farms.
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
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!
Organic Fish Emulsion with Kelp, one Gallon Size
- All natural plant food to help plants grow, flower, fruit and stay deep green.
- This liquid fertilizer is concentrated and must be diluted before use.
- Derived from: Whole fish and Kelp.
- One Gallon Size
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.
EB Stone Fish Emulsion with Kelp, Quart Size
- All natural plant food to help plants grow, flower, fruit and stay deep green.
- This liquid fertilizer is concentrated and must be diluted before use.
- Derived from: Whole fish and Kelp.
- Quart size
Indian River Organics Fish & Kelp Blend Fertilizer – OMRI Listed Organic Fertilizer (36 oz) 1 Quart- Liquid Organic Fish and Kelp for Turf, Flowers, Shrubs, Plants, Fruits & Vegetables
- ORGANIC FISH AND SEAWEED FERTILIZER: Now our all-natural high quality fish fertilizer is combined with North Atlantic kelp to produce a plant nutrient source that is beyond compare. Your plants get all the benefits of a natural liquid fish fertilizer PLUS all the additional benefits of seaweed in one easy to use liquid product. Plants receiving both fish and seaweed fertilizer out-perform in every category, they are much healthier and more resistant to heat, drought, and cold.
- FISH IS PACKED WITH AMINO ACIDS AND MICRO NUTRIENTS: Our liquid fish fertilizer is an industry leader and produces amazing results in fruits, vegetables, plants, and lawns. It provides much more than just N-P-K (Nitrogen, Phosphorus and Potassium) found in synthetic fertilizers. Our organic liquid fish fertilizer provides a comprehensive mix of amino acids & micro nutrients and minerals all in a usable form perfectly suited for maximum efficiency of uptake for your plants.
- SEAWEED IS AN AMAZING PLANT SUPPLEMENT: We add North Atlantic kelp that is pure and free of contaminants. It is manufactured using our proprietary digestion and refinement process that breaks down complex polysaccharides into smaller, lower molecular weight particles and novel compounds. These new compounds are not present in the original ascophyllum nodosum biomass and are now in a bio- available form and some have been modified making them water soluble allowing for immediate plant benefit.
- EASY TO APPLY FOR GREAT RESULTS: For Lawn: Mix 2 oz in 1 gallon of water, spray to cover 500 square feet. Fruits & Vegetables: Mix 4 oz in 1 gallon of water, spray to drench, including underside of leaves. Flowers & Plants: Mix 3 oz in 1 gallon of water, spray to drench, including underside of leaves. Citrus & Other Trees: Mix 4 oz in 1 gallon of water, spray to drench, including underside of leaves. Seedlings: Mix 4 oz in 1 gallon of water.
- TRUSTED & RELIABLE: At Indian River Organics, 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 possible. Our products are organic, easy to use, cost efficient, sustainable, and yield consistent & amazing results in your garden, no matter what you’re growing.
Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, Quart (32 oz) Concentrated Makes 180 Gallons
- FULLY ORGANIC SEAWEED AND KELP: A seven species blend of Ascophyllum Nodosum, Palmaria Palmata, Ecklonia Maxima, Laminaria Saccharina, Chlorella Vulgaris, Arthrospira Platensis, and Chondrus Crispus.
- EXTRACTED TO PROTECT NATURAL ENZYMES: Clean Kelp’s unique processing techniques give the cleanest possible kelp extract. Get all the benefits of natural kelp enzymes and hormones without the non-nutritious fibrous pulp that gives other kelps their thick, brackish appearance. You can see the difference.
- SIMPLE AND SAFE TO USE FOR ALL PLANTS: Add to every watering, it’s that easy. No risk of over application, plants love kelp. Clean Kelp aids in every stage of growth for root and stem health.
- FOR BOTH PLANTS AND LAWNS: Add Clean Kelp to all of your houseplants, vegetable garden, and your lawn for healthy green plants.
- FORMULATED AND MADE IN THE USA: Designed by botanists and plant chemists. Bloom City chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems
Fish Emulsion with Kelp & Fulvic Acid
- Biologically Active Formula: Omega Genetix Fish Emulsion is an organic liquid fertilizer derived from hydrolyzed fish, kelp (Ascophyllum nodosum), and fulvic acid, delivering a complete range of macro (N, P, K) and micronutrients to support key physiological processes including vegetative growth and reproductive development.
- Enhanced Nutrient Profile: Supplies essential secondary nutrients (Mg, S, Ca, Fe) critical for chlorophyll synthesis, enzymatic function, and root system architecture, aiding in photosynthetic efficiency and cellular metabolism across growth stages.
- Soil Microbial Synergy: The fish hydrolysate component promotes rhizosphere microbial activity, accelerating organic matter decomposition and enhancing the bioavailability of nutrients, contributing to improved soil structure and nutrient cycling.
- Fulvic Acid Efficacy: Contains low molecular weight fulvic acid to facilitate chelation and transmembrane transport of nutrients, leading to improved root development, nutrient uptake efficiency, and enhanced plant biomass and vigor.
- Application & Safety: Fully compatible with conventional NPK programs and certified 100% organic for agricultural use; non-toxic to crops but should not be ingested or exposed to animals due to potential biological activity.
Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement (128 oz) Concentrated Makes 750 Gallons
- FULLY ORGANIC SEAWEED AND KELP: A seven species blend of Ascophyllum Nodosum, Palmaria Palmata, Ecklonia Maxima, Laminaria Saccharina, Chlorella Vulgaris, Arthrospira Platensis, and Chondrus Crispus.
- EXTRACTED TO PROTECT NATURAL ENZYMES: Clean Kelp’s unique processing techniques give the cleanest possible kelp extract. Get all the benefits of natural kelp enzymes and hormones without the non-nutritious fibrous pulp that gives other kelps their thick, brackish appearance. You can see the difference.
- SIMPLE AND SAFE TO USE FOR ALL PLANTS: Add to every watering, it’s that easy. No risk of over application, plants love kelp. Clean Kelp aids in every stage of growth for root and stem health.
- FOR BOTH PLANTS AND LAWNS: Add Clean Kelp to all of your houseplants, vegetable garden, and your lawn for healthy green plants.
- FORMULATED AND MADE IN THE USA: Designed by botanists and plant chemists. Bloom City chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems
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
How do I choose between a fish‑only emulsion and a fish‑kelp blend?
Fish‑only emulsions, like the 1‑gallon Organic Fish Emulsion (B09FZTPQJL), provide a high nitrogen boost ideal for rapid vegetative growth. Fish‑kelp blends, such as GS Plant Foods Liquid Fish & Kelp (B00BBLMXVQ) or Indian River Organics (B07RC2DRTG), add trace minerals, hormones, and micronutrients from kelp that improve root development and stress tolerance. If you need quick foliage growth, go fish‑only; for balanced, long‑term health, a fish‑kelp blend is usually the better choice.
What dilution rates should I use for different plant types?
For houseplants, most products recommend 1–2 Tbsp of concentrate per gallon of water (e.g., Down To Earth suggests 2 Tbsp per gallon). Outdoor vegetables and fruiting plants typically need ¼–½ cup per gallon, while lawns often require 2–4 oz per gallon of water to cover 1,000 sq ft. Adjust the strength based on plant vigor and growth stage, and always start with the weakest solution to avoid burn.
Which product offers the best value per gallon?
GS Plant Foods Liquid Fish & Kelp (1 gal, B00BBLMXVQ) and Indian River Organics Fish & Kelp Blend (1 gal, B07RC2DRTG) are priced similarly but provide a broader nutrient spectrum, giving more bang for your buck. Pure fish emulsions like the Organic Fish Emulsion (B09FZTPQJL) are often slightly cheaper per gallon but lack the kelp’s micronutrients. For most gardeners, a fish‑kelp blend delivers the highest overall value because it combines nitrogen strength with kelp’s growth hormones.
Is the odor from fish emulsion a problem for indoor use?
All true fish emulsions have a characteristic fishy smell, as noted for the Down To Earth concentrate and the 1‑gallon Organic Fish Emulsion. The odor usually dissipates quickly after dilution and application, especially if you apply outdoors or in a well‑ventilated area. For indoor plants, dilute to the lowest effective strength and apply in the morning so the scent fades before evening.
How important is OMRI certification when selecting a liquid fertilizer?
OMRI certification, found on GS Plant Foods (B00BBLMXVQ) and Indian River Organics (B07RC2DRTG), guarantees the product meets organic standards for both home and commercial growers. This matters if you are growing certified organic produce or want assurance that no synthetic chemicals are present. While non‑certified products can still be effective, OMRI‑listed items provide peace of mind for strict organic gardening.
Do kelp‑only supplements provide the same nutrient benefits as fish‑kelp blends?
Kelp‑only products like Bloom City Seaweed & Kelp (B073ZNW8MX) excel at supplying hormones, micronutrients, and stress‑resistance compounds, but they lack the high nitrogen content of fish emulsions. Fish‑kelp blends combine the rapid nitrogen boost of fish with kelp’s micronutrients, delivering a more complete feeding program. If your soil already has sufficient nitrogen, a kelp‑only supplement can be a cost‑effective way to enhance vigor.
Can I combine a kelp supplement with a separate fish emulsion for better results?
Yes, many growers alternate a pure fish emulsion with a kelp‑only product to cover both macro‑ and micronutrient needs. For example, use the Organic Fish Emulsion (B09FZTPQJL) every 2‑3 weeks for nitrogen and follow with Bloom City Clean Kelp (B073ZNW8MX) in the next watering cycle. This staggered approach maximizes growth while minimizing the risk of over‑fertilizing any single nutrient.