Best Fish Emulsion For Plants: 10 Options Compared

#1 · Best Overall

1. Alaska Fish Fertilizer

• Form: Liquid
• Weight: 8.8 lb

Best for: Organic mixed-garden feeding.

Why it ranks #1: Its OMRI-listed 5-1-1 liquid is specified for vegetables, fruits, roses, shrubs, trees, and containers, making it a versatile garden fit.

OMRI listing paired with a gentle 5-1-1 fish formula makes Alaska a fit for gardeners who want an organic-use liquid for several kinds of plants. Its stated range includes vegetables, fruits, roses, shrubs, trees, and container plants, so one fertilizer can serve varied garden beds and pots.

The liquid form supports mixing and application, while the 5-1-1 analysis gives buyers a defined nutrient profile: 5% nitrogen, 1% phosphate, and 1% soluble potash. Alaska also identifies nutrients from fish solubles as contributing to soil enrichment, which suits gardeners looking beyond plant feeding alone. The listed uses span flower gardens, vegetables, and containers, making this a practical option for a mixed planting setup rather than a formula limited to one plant type.

Skip it if you need a stated mixing rate and schedule on the supplied listing; Fertilome 10611 provides rates for plants and trees.

Choose Alaska for an organic-use liquid feed across vegetables, flowers, and container plants, especially when soil enrichment matters too. Its listing does not specify a dilution rate, so it is less direct for buyers who need one.

Listed on Amazon as: Alaska Fish Fertilizer for Plants, OMRI Listed 5-1-1

#2 · Fish Hydrolysate

2. Neptune's Harvest Fish Fertilizer

• Form: Liquid
• Weight: 2.3 lb

Best for: Cold-processed fish hydrolysate.

Why it ranks #2: This liquid fish hydrolysate lists a 2-4-1 ratio and directions for houseplants, alongside uses for vegetables, flowers, fruit, trees, and grass.

Neptune’s Harvest uses a cold process that its listing says protects vitamins, amino acids, enzymes, and growth hormones, setting this fish hydrolysate apart on processing. The 2-4-1 liquid is listed for lawns, vegetables, flowers, and indoor plants, supporting a broad-use feeding routine.

The cold-process description connects the manufacturing method to retaining listed biological components, while the 2-4-1 analysis gives growers a concrete nitrogen, phosphate, and potash profile. The product is sourced from North Atlantic Ocean fish, with the listing specifying that it is not from lake, farmed, or river fish. For houseplants, the directions give a rate of one tablespoon per gallon of water. Prepare only what is needed for one application; diluted fertilizer should not be stored.

Skip it if you want to prepare and store diluted feed ahead of time; Fertilome 10611 gives mixing rates without that listed restriction.

Choose this for growers who value its cold-process fish hydrolysate and a stated houseplant dilution rate. Prepare only the amount needed for one application, since the directions say not to store diluted fertilizer.

Listed on Amazon as: Neptune's Harvest Fish Fertilizer (2-4-1) – Organic Liquid Plant Fertilizer – Fish Hydrolysate for Vegetables, Flowers, Fruit, Trees, Grass – Indoor and Outdoor Plant Food (Quart)

#3 · OMRI Listed

3. GS Plant Foods Liquid Fish Fertilizer

• Form: Liquid
• Weight: 8.4 lb

Best for: OMRI-listed hydrolyzed-fish concentrate.

Why it ranks #3: The one-gallon liquid is OMRI listed and provides hydrolyzed fish nutrition at 2-3-1 for gardens, lawns, and container growing.

OMRI listing for organic production is the key distinction of GS Plant Foods’ hydrolyzed fish concentrate. Its 2-3-1 formula is described as supplying primary nutrients and naturally occurring organic compounds, giving organic gardeners a defined liquid option for lawns, gardens, and container growing.

The 2-3-1 analysis identifies nitrogen, phosphate, and potash, while the hydrolyzed-fish description connects the formula to organic compounds that support soil vitality and consistent nutrition through the growing season. OMRI and NOP suitability is stated for organic growing, a useful qualification for buyers choosing inputs for that production approach. The listing covers gardens, lawns, and container growing, so this gallon-size liquid format can serve more than one setting. The supplied details do not state a dilution rate.

Skip it if you need a stated mixing rate before purchase; The Grow Co gives a one-ounce-per-gallon dilution direction.

GS Plant Foods suits organic growers seeking an OMRI-listed hydrolyzed fish concentrate for gardens, lawns, or containers. Its supplied details do not include a dilution rate, so buyers needing exact preparation guidance should choose accordingly.

Listed on Amazon as: GS Plant Foods Liquid Fish Fertilizer – Organic Material Review Institute Listed (1 Gallon) – Natural Hydrolyzed Fish Fertilizer for Gardens, Lawns & Container Growing

#4 · Garden Concentrate

4. The Grow Co Fish Fertilizer

• Form: Liquid
• Weight: 2.3 lb

Best for: Cold-pressed organic garden concentrate.

Why it ranks #4: This one-gallon liquid is a 2-3-1 fish formula, with directions to mix two tablespoons per gallon and apply every one to two weeks.

Freshly refined, cold-pressed fish emulsion is the defining feature of The Grow Co’s organic liquid fertilizer, which is described as retaining nutrients, vitamins, and amino acids. Its stated use covers vegetables, fruits, and flowers, offering an organic-focused option for mixed garden beds.

The concentrated liquid is mixed at one ounce, or two tablespoons, per gallon of water, giving gardeners a clear preparation rate for indoor and outdoor plant feeding. The listing recommends applying every one to two weeks, which helps establish a repeat routine. Its 2-3-1 analysis supplies a defined nutrient profile, and the use of sustainably sourced fish emulsion is presented as making use of fish parts that would otherwise go to waste. Apply the diluted mixture to plants.

Skip it if you want a fish fertilizer in powder form for concentrated batch preparation; LORD OF MILLET offers a water-soluble powder.

This fits gardeners seeking an organic liquid concentrate with a defined mixing rate and interval for vegetables, fruits, or flowers. It requires dilution with water, so it is not a direct-application choice.

Listed on Amazon as: Organic Fish Fertilizer for Vegetable Garden, Fruits, and Flowers, 1 Gallon

#5

5. ferti-lome Fish Emulsion

• Form: Liquid
• Weight: 1.2 lb

Best for: Measured plant-and-tree mixing.

Why it ranks #5: Its 5-1-1 liquid suits indoor and outdoor plants and trees, with specific mixing directions of one to two tablespoons per gallon for plants.

Fertilome gives separate dilution rates for plants and trees, making this fish emulsion a practical pick for gardeners who want specific mixing guidance. Its 5-1-1 analysis and indoor-outdoor use also provide a defined nutrient profile for applying one liquid formula across different plant settings.

For plants, the listing directs users to mix 1–2 tablespoons per gallon of water; for trees, it specifies 4 tablespoons per gallon. Those separate rates make it easier to plan applications for both smaller plantings and trees without guessing from a single general direction. The 5-1-1 analysis identifies nitrogen, phosphate, and soluble potash, while the water-mixable liquid can be applied by a convenient method. Shake well before use, as directed.

Skip it if you need a stated feeding interval as well as dilution rates; The Grow Co specifies application every 1–2 weeks.

Fertilome fits gardeners who value measured plant and tree dilution directions and a defined 5-1-1 analysis. It can serve indoor or outdoor plants, but buyers who plan around a set feeding interval will need that schedule from another source.

Listed on Amazon as: Fertilome (10611) Fish Emulsion Fertilizer 5-1-1, 16 oz

#6 · Fish and Seaweed

6. Neptune's Harvest Fish & Seaweed

• Form: Liquid
• Weight: 2.3 lb

Best for: Fish-and-seaweed all-purpose feeding.

Why it ranks #6: The 2-3-1 liquid combines 75% fish and 25% seaweed and is listed for vegetables, flowers, fruit, trees, lawns, and indoor plants.

Neptune’s Harvest combines 75% fish with 25% seaweed, distinguishing this liquid fertilizer from fish-only formulas. The blend is presented as an all-purpose organic plant food for vegetables, flowers, trees, lawns, and indoor plants, making it relevant to gardeners feeding varied plantings with one product.

The fish-and-seaweed combination supplies a broader ingredient mix than a fish-only emulsion, while the 2-3-1 analysis gives a defined nutrient profile. Its stated range includes both indoor and outdoor plants, plus lawns and trees, so the same liquid product can fit several parts of a garden routine. The directions say to shake well before use; that simple preparation step is worth building into each application. The listing also identifies it as safe for kids and pets.

Skip it if you need a stated mixing rate and schedule; The Grow Co lists both dilution and 1–2-week application timing.

This fits gardeners who want fish and seaweed together for a range of indoor and outdoor plants. If your routine depends on a stated dilution rate or feeding interval, the supplied listing leaves those details unspecified.

Listed on Amazon as: Neptune's Harvest Fish & Seaweed Liquid Fertilizer (2-3-1) – 36oz Bottle – Plant Food for Garden – Indoor & Outdoor Organic Plant Fertilizer for Vegetables, Flowers, Fruit, Trees & Lawns

#7

7. Heirloom Founder's Fish Fertilizer

• Form: Liquid
• Weight: 4 oz

Best for: Rose-and-tomato focused feeding.

Why it ranks #7: This liquid specifically targets rose and tomato plants, with soil-application directions and separate feeding intervals for in-ground and container plants.

A stated soil-application rate that serves two to three roses per gallon makes Heirloom Founder’s Fish Fertilizer especially specific to rose care. The listing also names tomato plants, with decomposed fish organic matter described as feeding mycorrhizae and supporting healthy soil bacteria.

For soil application, mix four ounces per gallon of water; the listing says that amount of solution is enough for two to three roses. It recommends feeding in-ground plants every four to six weeks and container plants every three to four weeks, helping rose growers plan around different growing setups. The formula is derived from acidulated fish solubles and includes multiple fish species, which the listing associates with greater soil mineralization. Its use emphasis is roses and tomatoes.

Skip it if you want a lower-volume dilution rate for routine mixing; Fertilome 10611 lists one to two tablespoons per gallon for plants.

This is a targeted choice for rose growers who can follow its per-gallon soil rate and separate in-ground and container schedules. Tomato growers are also named, but the detailed coverage guidance centers on roses.

Listed on Amazon as: Heirloom Founder's Fish Fertilizer, Liquid Plant Food, 32 Fl Oz

#8

8. LORD OF MILLET Fish Powder

• Form: Powder

Best for: Concentrated powder for larger plots.

Why it ranks #8: The 12-2-2 powder makes up to 100 gallons per pound and is directed for use every one to two weeks across several plant types.

A powder rate of one pound for up to 100 gallons of feed gives LORD OF MILLET a concentrated format suited to gardeners preparing larger volumes. Its 12-2-2 analysis and water-soluble fish-protein powder offer a different mixing workflow from ready-to-handle liquid fish fertilizers.

The listing says the powder is highly water-soluble when mixed and gives a clear preparation ratio: one pound makes up to 100 gallons. That concentrated batch size can suit large vegetable plots or indoor and hydro gardens, while the stated 1–2-week application interval helps organize repeat feeding. Its 12-2-2 profile supplies more nitrogen relative to the listed phosphate and potash figures than a balanced low-nitrogen formula, a consideration when selecting a nutrient profile.

Skip it if you want a liquid formula without first dissolving powder; Alaska Fish Fertilizer 5-1-1 is listed in liquid form.

Pick this powder for large plots or hydro gardens where preparing a concentrated batch suits your routine. It requires mixing before use, so gardeners seeking a liquid fish emulsion ready for dilution may prefer a liquid-form option.

Listed on Amazon as: Fish Emulsion Fertilizer 12-2-2 Powder (3.3 pounds Powder-Up to 300 Gallons of Water), for Vegetables, Trees, Lawns, Shrubs, Flowers, Fruits

#9

9. TPS NUTRIENTS Fish Emulsion

• Form: Liquid

Best for: Root-focused small-garden feed.

Why it ranks #9: This 8-ounce liquid lists root, leaf, and stem support for indoor and outdoor gardens, but provides no NPK ratio in the supplied data.

Root-strength support is the clearest distinction of TPS Nutrients’ liquid salmon supplement, which also targets lush foliage and steady plant growth. Its stated use covers indoor and outdoor gardens, giving growers tending houseplants alongside outdoor vegetables a single fish-emulsion option centered on root and shoot development.

TPS links its formula to healthy roots and improved nutrient and water uptake, a useful emphasis for growers focused on plant establishment and root function. It also describes support for rich green growth and steady leaf and stem development, connecting root care with visible above-ground growth. The liquid format is suited to a mixing workflow, though the listing says directions are included rather than providing the dilution rate in the supplied details. Protective gloves and eyewear are specified for handling.

Skip it if you want the application rate stated in the listing; Fertilome 10611 gives plant and tree mixing directions.

This suits indoor and outdoor growers prioritizing roots as well as foliage, including vegetable gardeners. Choose another listing if you need a visible dilution rate before buying; TPS says directions are included but does not give the rate here.

Listed on Amazon as: Fish Emulsion Fertilizer – Liquid Salmon Supplement for Plants, 8 oz

#10

10. Mandea Alaska Fish Fertilizer

• Form: Liquid
• Weight: 1.5 lb

Best for: Hydroponic and organic-garden use.

Why it ranks #10: The 946 ml liquid is described for hydroponic and organic gardening, but its supplied details do not state an NPK ratio or mixing rate.

Hydroponic and organic-gardening suitability is the central use case listed for Mandea’s Alaska fish fertilizer. Its liquid form is intended for convenient measuring and mixing, giving growers a straightforward format for applying plant food across a range of plants without handling a powder.

The 946 ml bottle is described as a liquid that can be measured and mixed, a format that supports controlled preparation and even distribution to roots. The listing names both hydroponic and organic gardening, so the product may suit growers working in either of those settings. It also gives storage guidance: keep it in a cool, dry place away from heat and open flames, and keep it out of reach of children and pets. No nutrient analysis is supplied in the provided details.

Skip it if you need a stated nutrient ratio to compare formulas; Alaska Fish Fertilizer 5-1-1 lists its analysis.

Mandea suits growers seeking a liquid option listed for hydroponic and organic gardening, with storage guidance included. Buyers who select fertilizer by NPK ratio should note that no analysis appears in the supplied details.

Listed on Amazon as: FERTILIZ ALASKA FISH QT