Comparison: Best Omri Fish Fertilizer (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, OMRI-certified fish fertilizers are a top choice for eco-conscious growers. 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 top contenders, and compared their ingredients, effectiveness, and value. Whether you’re nurturing lush tomatoes or vibrant flowers, the right fish fertilizer can make all the difference—let’s find the best one for your garden.
- Best for versatile 5-1-1: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin‑rich fertilizer: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for macro‑micro boost: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
- Best for fish‑kelp fusion: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for premium hydrolyzed: Indian River Organics OMRI Listed Organic
- Best for soil‑microbe boost: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for concentrated fish poop: Ounce Of Hope OMRI Listed Organic Concentrated Fish Poop – Liquid Fertilizer for Vegetable Gardens
- Best for high‑nitrogen boost: Down to Earth Fish Meal Natural Fertilizer 8-6-0 OMRI
- Best for balanced marine blend: Down To Earth All Natural Fertilizers Organic Bio-Fish – Plant Food for Corn
- Best for recycled fish hydrolysate: Drammatic® Organic™ Original Fertilizer 2-4-1
Product Comparison: Best Omri Fish Fertilizer
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
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.
Indian River Organics OMRI Listed Organic, Hydrolyzed Liquid Fish Fertilizer, 1 Quart / 36 ounces net wt.
- Far Superior to Emulsions: Our Proprietary Cold-Process Hydrolysis Preserves the Complex Nutrients that create Bigger Flower Blooms, Tastier Fruits & Vegetables, and Vibrant Green Lawns.
- 100% OMRI-LISTED Organic: Has the Organic Materials Review Institute (OMRI) seal (our competitors don’t)! Approved & suitable for use in certified organic operations under the USDA National Organic Program.
- Free of Contaminants: Our High-Quality Hydrolysate Fertilizer is Sustainably Produced from fresh, healthy, food-quality fish, free of chlorine, mercury, and other heavy metals. Family & pet friendly.
- EASY TO USE and Won’t Clog Equipment: Water Soluble; Just Mix with Water and Apply! We win new customers because our product works flawlessly with application equipment. Safely access your lawn after application. No waiting period.
- 100% Quality Guarantee: We’re incredibly proud of our product’s consistency, and we guarantee our nutrient analysis in every bottle. If you have concerns, let us know and we’ll be happy to work with you.
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.
Ounce Of Hope OMRI Listed Organic Concentrated Fish Poop – Liquid Fertilizer for Vegetable Gardens, Indoor Plant Food for Houseplants, Hydroponic Nutrients, Soil Amendment (16 Ounces)
- CERTIFIED ORGANIC FISH POOP: Made from pure, unadulterated koi and tilapia fish manure. Concentrated liquid fertilizer feeds while restoring soil with beneficial microbial, fungal, and protozoan life that stabilize soil structure and increase nutrient uptake. All-Natural, Odorless (ammonia free), Non-Toxic.
- ALL PURPOSE LIQUID PLANT FOOD for use outdoor & indoor. 2-1-4 NPK ratio provides an excellent foundation for vegetables, flowers, herbs, fruit trees, lawns, outdoor plants, and aquatic plants. Weekly 3rd party analysis verifies the presence of valuable micronutrients such as Zn, Cu, Mn, Fe, B, S, Na, Mg, Ca, Mo.
- INCREASES YIELD & FLAVOR: Fish Poop improves every stage of growth, from seed to flush. Nutrient bioavailability results in higher concentrations of terpenes, terpinoids, aromatic volatiles, essential oils and flavonoids; resulting in tastier tomatoes, more fragrant flowers, hoppier hops, and (of course) happier hemp.
- COLLECTED FROM AQUAPONIC HEMP FARM in Memphis, TN The fish we care for are fed premium quality, organic aquaponic food made to our specs. Our system is far more sustainable than all other manure production processes. Ounce of Hope produces a significant quantity of consumer and certified medicinal products and extracts. Open to inquiries.
- HIGHLY CONCENTRATED: Per gallon mix: General feed & soil conditioner 1-2 oz, Veg 6-10 oz, Flower 8-12 oz. 2x quantity if sole nutrient source. Suitable for agriculture & horticulture pursuits of any scale; soil, soilless, aquaponics & hydroponics. Filter/screen before small emitters used to fertigate. Not recommended combined with synthetic (salt-based) nutrients. Amazing for solo use during flush. Great in conjunction with / in the same manner as worm tea fertilizer or worm casting tea. Commercial quantities available.
Down to Earth Fish Meal Natural Fertilizer 8-6-0 OMRI
- High-Nitrogen Formula (8-6-0): Promotes lush green growth, especially in early plant development and leafy crops like greens, corn, and brassicas.
- Excellent Source of Organic Phosphorus: Encourages strong root growth and flower development, helping to build a solid foundation for fruiting and flowering.
- OMRI Listed for Organic Use: Approved for use in certified organic farming and gardening; made from high-quality, sustainably sourced fish.
- Improves Soil Fertility: Enhances microbial life in the soil, increasing nutrient uptake and long-term soil health.
- Versatile for Garden & Landscape Use: Great for vegetables, flowers, shrubs, trees, and lawns—perfect for pre-planting soil prep or side-dressing throughout the season.
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.
Drammatic® Organic™ Original Fertilizer 2-4-1, Hydrolyzed Liquid Fish Fertilizer for Vegetables, Flowers, and Fruits, 1 Quart (32 Ounces), OMRI Listed
- Drammatic Organic Original Fertilizer 2-4-1 is an all-purpose outdoor liquid fertilizer for vegetables, flowers, and fruits.
- Drammatic Original Fertilizer is an excellent natural-based blend that can be applied to the root zone of plants and/or sprayed directly onto leaf surfaces.
- It is made from recycled fish scraps that would otherwise fill landfills into an effective and environmentally friendly fertilizer. The fish scraps are processed at low temperatures to maintain the integrity of naturally occurring amino acids, vitamins, hormones, and enzymes essential in feeding soil microbes, earthworms, and plants. The raw material is then stored in digestion tanks to liquify the product. This method produces a product called a “fish protein hydrolysate.”
- This exact formulation is used by professional growers worldwide in organic crop production and is OMRI listed for organic, sustainable, or conventional crops.
- Made in the USA.
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 when choosing an OMRI‑listed fish fertilizer?
First check the N‑P‑K ratio and whether the product includes additional micronutrients or seaweed, as these affect plant stage needs. Verify that the label carries the OMRI certification, which guarantees suitability for organic production. Also consider the form (liquid vs. granular) and the recommended application rates for your garden size.
How do liquid fish fertilizers compare to fish‑meal granules?
Liquid formulas, such as the GS Plant Foods or Indian River Organics products, dissolve quickly and can be applied as a foliar spray for rapid nutrient uptake. Granular options like Down to Earth Fish Meal release nutrients more slowly, providing a steady feed and easier handling for large beds. Choose liquids for fast response and granules for long‑term soil building.
Which product offers the best value for large garden beds?
The 1‑gallon GS Plant Foods Liquid Fish & Kelp Fertilizer (B00BBLMXVQ) provides a high concentration at a lower price per ounce and covers up to 1,000 sq ft per mix, making it economical for extensive areas. For those preferring a single‑ingredient option, the 115 oz Alaska Fish Fertilizer (B0DQ2LNX35) also offers a large volume at a competitive cost. Compare unit prices and recommended dilution to decide which fits your budget.
Are there differences in nutrient profiles that affect specific plant types?
Yes; products with a higher nitrogen ratio (e.g., Down to Earth 8‑6‑0) excel for leafy greens and early vegetative growth, while balanced formulas like 7‑7‑2 or 5‑1‑1 support both root development and flowering. Formulations that include kelp or seaweed add natural hormones and micronutrients that boost fruiting and stress tolerance. Match the ratio and additives to the growth stage of your crops for optimal results.
How important is the presence of kelp or seaweed in a fish fertilizer?
Kelp contributes natural plant hormones, trace minerals, and hormones that improve root architecture and stress resilience, which can be especially beneficial for fruiting plants and seedlings. Products such as GS Plant Foods Fish & Kelp blends (B00A2A2GT6) combine these benefits with fish nutrients, offering a more complete feeding program. If you grow a variety of crops, a kelp‑enhanced fertilizer often provides the most versatile performance.
Can I use these fertilizers on indoor plants as well as outdoor?
All of the listed fish fertilizers are safe for indoor use when diluted according to the manufacturer’s instructions, making them suitable for houseplants, herbs, and container gardens. Liquid concentrates are easier to apply indoors because they can be mixed with water and poured directly onto the soil or used as a light foliar mist. Just ensure good ventilation and avoid over‑watering, which can cause root issues.
What are the environmental considerations when selecting a fish‑based fertilizer?
Look for products that are certified OMRI, sourced from sustainably harvested fish, and free of heavy metals or chlorine, such as Indian River Organics and Ounce Of Hope. Some brands emphasize low‑odor, ammonia‑free formulations, reducing impact on indoor air quality and nearby neighbors. Choosing a concentrate reduces packaging waste and transport emissions compared with larger, pre‑diluted containers.
How do application rates differ among the listed products?
Rates vary widely: for example, the GS Plant Foods 1‑gallon concentrate recommends 2 oz per gallon of water for a soil drench, while the Down to Earth 8‑6‑0 fish meal is typically side‑dressed at 1–2 lb per 100 sq ft. Ounce Of Hope’s highly concentrated fish poop suggests 1–2 oz per gallon for general feeding but up to 10 oz per gallon for heavy‑feeding veg crops. Always start with the lowest recommended dilution and adjust based on plant response.