Comparison: Best Fish Fertilizer For Trees (Updated | Dec 1st)
When it comes to giving your trees the nourishment they truly need, not all fertilizers are created equal—especially when you’re choosing the **best fish fertilizer for trees**. Packed with natural nutrients and gentle on roots, fish-based options have become gardeners’ favorites for good reason. But which one delivers the best results without breaking the bank? In this article, we’ll break down the top contenders, comparing ingredients, effectiveness, and value so you can make a confident choice that keeps your trees thriving year after year.
- Best for omri tree boost: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin-rich blend: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for cold-pressed power: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for tree-focused formula: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Best for wintergreen fresh: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- 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 compact kelp boost: Omri Listed Fish & Kelp Fertilizer for Plants by GS Plant Foods (36oz) – Organic Fertilizer for Vegetables
- Best for odor‑free harvest: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for powdered nutrient surge: Fish Emulsion Fertilizer 12-2-2 Powder (3.3 pounds Powder-Up to 300 Gallons of Water)
- Best for hydrolyzed growth: GS Plant Foods Organic Liquid Fish Fertilizer – Natures Growth Boost
Product Comparison: Best Fish Fertilizer For Trees
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!
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.
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
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.
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.
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
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
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.
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 NPK ratio is ideal for tree nutrition and which fish fertilizers match it?
Trees generally benefit from a higher nitrogen level to promote vigorous leaf growth, with a moderate amount of phosphorus and potassium; a 5-1-1 ratio is a common choice. Products that provide this ratio include Alaska Fish Fertilizer OMRI Listed 5-1-1 (B0DQ2LNX35), Fertilome Fish Emulsion 5-1-1 (B000OWJM44), and Alaska Fish Emulsion Concentrate 5-1-1 (B002RH0B26). These formulas deliver the balanced nutrients needed for both young saplings and mature trees.
How does odor affect choosing a fish fertilizer for trees?
Strong fishy odor can be off‑putting for indoor or close‑quarter use, but it often indicates a true fish‑based product with full nutrient content. Neptune’s Harvest (B0012Q2TFA) and the 1‑gallon Organic Fish Emulsion (B09FZTPQJL) are noted for their pungent smell, while Alaska’s deodorized version (B002RH0B26) uses natural wintergreen to mask odor. If you plan to apply fertilizer near living spaces, a low‑odor option may be preferable.
Are there any OMRI‑listed fish fertilizers that are safe for organic orchards?
Yes, several products carry OMRI certification, confirming they meet organic standards. Alaska Fish Fertilizer OMRI Listed 5-1-1 (B0DQ2LNX35), GS Plant Foods Liquid Fish & Kelp Fertilizer (B00BBLMXVQ), and the GS Plant Foods Fish & Kelp blend (B00A2A2GT6) are all OMRI listed and suitable for use in certified organic tree production.
Which fish fertilizers provide the highest nitrogen concentration for fast tree growth?
The highest nitrogen percentages are found in the 5-1-1 formulas, delivering 5% nitrogen, which is ideal for rapid foliage development. Alaska’s 5-1-1 concentrate (B002RH0B26) and Fertilome’s 5-1-1 (B000OWJM44) each contain this level. For an even higher nitrogen boost, the 12-2-2 powder (B0F38LT29B) offers 12% nitrogen, though it requires dilution to avoid over‑feeding.
How do liquid concentrates compare to powder forms for large‑scale tree applications?
Liquid concentrates, such as the 1‑gallon Organic Fish Emulsion (B09FZTPQJL) and GS Plant Foods Liquid Fish & Kelp (B00BBLMXVQ), are easy to mix on‑site and provide uniform coverage, which is useful for large trees and orchard rows. Powder forms like the 12-2-2 Fish Emulsion Powder (B0F38LT29B) are highly concentrated, allowing a small weight to treat many gallons of water, but they require thorough dissolution to prevent clumping. Choice often depends on storage space, handling preferences, and the scale of the operation.
Can fish fertilizers be used without burning the roots of mature trees?
Most reputable fish emulsions are formulated to be gentle and non‑burning when applied at the recommended dilution rates. Central Garden Brands Fish Emul Fertilizer (B000BX4QGK) explicitly states it does not burn, and Alaska’s deodorized 5-1-1 concentrate (B002RH0B26) also highlights a burn‑free formula. Always follow label instructions—typically 4 tablespoons per gallon of water for trees—to ensure safe application.
What are the cost‑per‑gallon considerations when selecting a fish fertilizer for trees?
Powdered fertilizers like the 12-2-2 Fish Emulsion Powder (B0F38LT29B) can be the most economical per gallon of mixed solution, as one pound makes up to 100 gallons of feed. Liquid concentrates vary; the 1‑gallon Organic Fish Emulsion (B09FZTPQJL) offers a higher price per ounce but provides a ready‑to‑mix product without extra processing. Compare the total cost of the product, the dilution ratio, and the volume of solution you need for your tree canopy to determine true value.
How important is the inclusion of kelp or seaweed in a fish fertilizer for tree health?
Kelp adds trace minerals, hormones, and natural growth promoters that complement the nitrogen‑rich fish base, enhancing root development and stress resistance. GS Plant Foods’ Fish & Kelp blends (B00BBLMXVQ and B00A2A2GT6) combine these benefits, making them especially useful for trees under drought or nutrient‑poor conditions. While kelp is not essential, its presence can improve overall vigor and may lead to higher fruit or timber yields.