Comparison: Best Biofish Liquid Fish Fertilizer (Updated | Nov 30th)
If you’re looking to give your garden a natural boost, liquid fish fertilizer is a top contender—and biofish options are leading the pack. But with so many brands claiming to be the best, how do you know which one truly delivers? We’ve dug into the details, tested real results, and compared the top biofish liquid fertilizers to help you choose wisely. Whether you’re growing veggies, flowers, or lush greens, the right formula can make all the difference.
- Best for balanced bio-fish: Down To Earth All Natural Fertilizers Organic Bio-Fish – Plant Food for Corn
- Best for bulk bio-fish: Down to Earth Organic Bio-Fish Fertilizer Mix 7-7-2
- Best for low npk starter: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin-rich emulsion: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for cold-pressed concentrate: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for fish & kelp fusion: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for pure fish boost: GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens
- Best for macro-micro power: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
- Best for compact fish-kelp: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for rapid-acting liquid: 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
Product Comparison: Best Biofish Liquid Fish Fertilizer
Down To Earth All Natural Fertilizers Organic Bio-Fish – Plant Food for Corn, Broccoli, Kale, Trees and Shrubs 7-7-2, 5 lb
- Balanced NPK Formula (7-7-2): Provides equal parts nitrogen and phosphorus for robust vegetative growth and root development, plus potassium for improved resilience and bloom support.
- Marine-Based Fertility Boost: Made with fish meal and fish bone meal—ideal for improving soil biology and long-term fertility.
- OMRI Listed for Organic Use: Safe and approved for certified organic farming and gardening systems.
- Feeds Soil & Plants Naturally: Encourages beneficial microbial activity, resulting in better nutrient absorption and stronger plants.
- Great for Vegetables, Fruits & Flowers: Versatile enough for raised beds, garden rows, containers, and landscape use.
Down to Earth Organic Bio-Fish Fertilizer Mix 7-7-2, 50 lb
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
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!
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.
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).
GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost, OMRI-Certified, Hydrolyzed, Fish-Based, Organic Gardening Solution, 1 Quart
- OMRI ORGANIC LISTED HYDROLYZED FISH FERTILIZER: GS Plant Foods Organic Liquid Fish is an all-natural high quality fresh fish liquid fertilizer that gives excellent plant growth, rebuilds soil, and offers higher production yields. Our fish fertilizer will help stimulate growth and improve plant health and color. Tremendously beneficial for soil quality and improved rooting, this organic fish fertilizer can be applied to any type of soil or plant without concern for waste or harmful chemicals.
- PACKED WITH MACRO & MICRO NUTRIENTS: Our proprietary and all-natural fish fertilizer provides much more than N-P-K (Nitrogen, Phosphorus and Potassium) found in synthetic fertilizers. This fish plant fertilizer provides a comprehensive mix of macro & micro nutrients, minerals, peptides, proteins, and calcium, all in a usable form perfectly suited for maximum efficiency of uptake for your plants. The fish plant food fertilizer stimulates water penetration and increases nutrient assimilation.
- OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, liquid fish fertilizer organic acts as an efficacious growth promoter. GS Plant Foods organic hydrolyzed fertilizer promotes growth of healthy bacteria. It is used extensively on a commercial basis, as well as at home as an organic soil conditioner. The end result is a powerfully effective, organic fertilizer and soil supplement that contains no chlorine or heavy metals. It is great for everything that grows!
- WORKS SYNERGISTICALLY WITH ALL FERTILIZERS:This liquid fish fertilizer is among the highest quality plant food products that you can get. It works synergistically with all fertilizers especially with a high quality liquid kelp fertilizer such as GS Plant Foods Organic Liquid Kelp. Use fish fertilizer on lawns, vegetables, fruits, trees & shrubs, seedlings and transplants as a regular healthful maintenance program to experience healthier plants with stronger, and more developed root systems.
- EASY TO APPLY FOR NATURAL GREAT RESULTS: Apply hydrolyzed fish fertilizer to improve specific growth stages. Apply generously to soil or as a foliar feed until leaves are wet, top and bottom. For lawns, one gallon of fertilizer mixed with 30-40 gallons of water will cover ¼ acre. Feed lawn every 4 weeks. Trees and shrubs use 4 oz per gallon of water. Feed by boring small holes 1 to 2 feet away from the root ball. Fill holes with solution. For best results, foliar feed early or late in the day.
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.
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
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 look for in a liquid fish fertilizer for organic gardening?
First check the NPK ratio; a balanced 7‑7‑2 blend like Down To Earth provides strong vegetative growth, while a 2‑3‑1 ratio is gentler for frequent feeding. Verify that the product is OMRI listed, which guarantees it meets organic standards. Also consider added ingredients such as kelp or seaweed, which supply micronutrients and improve soil microbiology.
How do fish‑only fertilizers compare to fish‑and‑kelp blends?
Fish‑only formulas, such as Alaska Fish Fertilizer (5‑1‑1), deliver high nitrogen for rapid leaf growth but lack the trace minerals found in kelp. Fish‑and‑kelp blends, like the Down To Earth Liquid Fish & Kelp Concentrate, add seaweed’s natural hormones that boost flowering and root development. For a balanced garden, the kelp addition often results in more vigorous blooms and better stress tolerance.
Which product gives the best value per ounce?
The 1‑gallon GS Plant Foods Liquid Fish Fertilizer (2‑3‑1) provides roughly 128 oz of product, making its cost per ounce lower than most 50‑lb bags when you factor in concentration. The Down To Earth 50‑lb bag also offers good bulk pricing, but you’ll need to dilute more water for each application. Compare the total nutrient content and recommended dilution rates to determine true cost efficiency.
Is the strong fish odor a problem for indoor use?
All genuine fish emulsions have a noticeable scent, as highlighted by the 1‑gallon Organic Fish Emulsion that “smells like fish.” The odor usually dissipates quickly after mixing and applying, especially when used outdoors or in well‑ventilated spaces. If indoor use is essential, choose a low‑odor formulation and apply during cooler parts of the day to minimize lingering smell.
How do I choose the right NPK ratio for my garden’s needs?
For heavy feeders like tomatoes or corn, a higher nitrogen ratio (e.g., 7‑7‑2) supports vigorous foliage and root growth. Light‑feeding vegetables, herbs, or seedlings benefit from a milder 2‑3‑1 blend, which reduces the risk of burn and encourages steady development. Match the ratio to the growth stage: higher phosphorus for flowering, higher nitrogen for leafy growth.
Can these fertilizers be used on container plants and houseplants?
Yes, most liquid fish fertilizers work well in containers; just follow the reduced dilution guidelines (typically 2‑4 Tbsp per gallon of water). The Central Garden Brands Fish Emul Fertilizer and the Down To Earth liquid concentrate both list specific rates for houseplants. Because containers dry out faster, apply every 2‑3 weeks and monitor for any signs of over‑fertilization.
What added benefits do kelp ingredients provide?
Kelp supplies natural plant hormones like cytokinins and auxins, which enhance seed germination, root branching, and stress resistance. It also contributes a suite of micronutrients and trace minerals that synthetic fertilizers often lack. When combined with fish emulsion, kelp improves nutrient uptake efficiency and promotes a healthier soil microbial ecosystem.
How important is OMRI certification when selecting a fish fertilizer?
OMRI certification ensures the product complies with USDA organic regulations, meaning it contains no prohibited synthetic chemicals. This is crucial for growers who sell certified organic produce or who want to maintain soil health without synthetic inputs. All listed options, including GS Plant Foods and Down To Earth, carry OMRI approval, giving you confidence in their organic integrity.