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Fish Fertilizer For Plants

10 Best Fish Fertilizer For Plants 2025 in the United States

#1

Winner

9.8 score

Neptune's Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)

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Neptune's Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)

Neptune's Harvest

9.8 score

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Neptune's Harvest Fish & Seaweed Fertilizer 2-3-1 is a liquid fertilizer that combines fish and seaweed to provide essential nutrients for plant growth. The NPK ratio of 2-3-1 means it has 2% nitrogen, 3% phosphorus, and 1% potassium, which supports balanced plant growth, flowering, and root development. Its liquid form makes it easy to mix and apply using various methods such as hand watering, sprayers, or drip lines, making it versatile for different gardening needs.

Rating
9.8
Chosen by1,161
Form (Liquid or Granular)
Odor
Organic Certification

Most important from
6790 reviews

Form (Liquid or Granular)
Its liquid form is easy to apply and quickly absorbed by plants, making it convenient for gardeners.
Odor
Despite its strong, fishy odor, the exceptional results make it a worthy investment for dedicated gardeners.
Organic Certification
The product is especially effective for organic gardening, with visible improvements in plant health within a day or two.
Nutrient Content
The fertilizer's natural and sustainable formulation, made from fish and seaweed, provides essential nutrients that promote strong root development, vigorous foliage growth, and prolific flowering.
#2
9.6 score

Omri Listed Fish & Kelp Fertilizer by GS Plant Foods (1 Gallon) - Organic Fertilizer for Vegetables, Trees, Lawns, Shrubs, Flowers, Seeds & Plants - Hydrolyzed Fish and Seaweed Blend

Omri Listed Fish & Kelp Fertilizer by GS Plant Foods (1 Gallon) - Organic Fertilizer for Vegetables, Trees, Lawns, Shrubs, Flowers, Seeds & Plants - Hydrolyzed Fish and Seaweed Blend

GS Plant Foods

9.6 score

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The GS Plant Foods OMRI Listed Fish & Kelp Fertilizer is an organic liquid fertilizer that combines fish and seaweed to promote plant growth. Its NPK ratio, while not explicitly stated, likely balances nutrients from both fish and kelp sources. The fertilizer is in liquid form, making it easy to mix with water and apply to various plants, including vegetables, trees, lawns, shrubs, and flowers.

Rating
9.6
Odor
Application Method

Most important from
2613 reviews

Odor
Despite the fishy odor, the benefits of this organic fertilizer far outweigh the temporary smell.
Application Method
Spraying the fertilizer on leaves dramatically reduces purple discoloration in tomato plants overnight.
#3
9.4 score

Organic Fish Fertilizer - Liquid Fish Emulsion Food for Plants, Flowers, Fruits & Vegetables - 2-3-1 NPK - Made from Sustainably Sourced Hydrolyzed Fish (1 Gallon)

Organic Fish Fertilizer - Liquid Fish Emulsion Food for Plants, Flowers, Fruits & Vegetables - 2-3-1 NPK - Made from Sustainably Sourced Hydrolyzed Fish (1 Gallon)

The Grow Co

9.4 score

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The Organic Fish Emulsion Fertilizer by The Grow Co. is a 1-gallon liquid fertilizer designed for plants, flowers, fruits, and vegetables. It's specifically crafted to be an environmentally friendly option, made from sustainably sourced fish parts using a cold-press method that preserves nutrients, vitamins, and amino acids.

Rating
9.4
Odor

Most important from
306 reviews

Odor
This fish emulsion is much thinner and less fishy smelling than other brands, making it more pleasant to use.

Top 10 Best Fish Fertilizer For Plants 2025 in the United States

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Slide 1

Humboldts Secret

Humboldts Secret Starter Kit Pack XL – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

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#1

Winner

9.8 score

Slide 1Slide 2

Neptune's Harvest

Neptune's Harvest Fish & Seaweed Fertilizer 2-3-1 (Gallon)

NPK Ratio: 2-3-1
Form (Liquid or Granular): Liquid
Odor: Strong
Application Method: Hand watering, sprayers, drip lines
Nutrient Content: Fish and seaweed

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19% OFF

Chosen by 1161 this week

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Slide 1

Humboldts Secret

Humboldts Secret Starter Kit Pack XL – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

Check price

#2

9.6 score

Slide 1Slide 2Slide 3Slide 4Slide 5

GS Plant Foods

Omri Listed Fish & Kelp Fertilizer by GS Plant Foods (1 Gallon) - Organic Fertilizer for Vegetables, Trees, Lawns, Shrubs, Flowers, Seeds & Plants - Hydrolyzed Fish and Seaweed Blend

Form (Liquid or Granular): Liquid
Odor: strong
Organic Certification: OMRI Listed
Application Method: mix with water

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#3

9.4 score

Slide 1Slide 2Slide 3Slide 4Slide 5

The Grow Co

Organic Fish Fertilizer - Liquid Fish Emulsion Food for Plants, Flowers, Fruits & Vegetables - 2-3-1 NPK - Made from Sustainably Sourced Hydrolyzed Fish (1 Gallon)

NPK Ratio: 2-3-1
Form (Liquid or Granular): Liquid
Odor: Strong fishy odor
Application Method: Soil drench, foliar spray
Nutrient Content: Nutrients, vitamins, amino acids

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#4

9.2 score

Slide 1

Lilly Miller

Lilly Miller Alaska Fish Fertilizer 5-1-1 Concentrate 1 Quart (2-Pack)

NPK Ratio: 5-1-1
Form (Liquid or Granular): Liquid
Odor: Strong
Application Method: Mix with water, apply to plants
Nutrient Content: High nitrogen

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#5

8.9 score

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Neptune's Harvest

Neptune's Harvest Fish Fertilizer 2-4-1, 36 Ounce

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26% OFF

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#6

8.6 score

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ALASKA

ALASKA Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Тwо Расk)

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#7

8.3 score

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uNlEaSh

Alaska Fish Emulsion Fertilizer All Purpose 5-1-1 1 gal

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#8

8.0 score

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FoxFarm

FoxFarm Bush Doctor Wholly Mackerel Fish Fertilizer, Fx14113 - Liquid Plant Nutrient for Seedlings, Transplants, and Vegetative Growth – NPK 3-1-0 (Pint)

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25% OFF
#9

7.8 score

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Bloom City

Organic Wild Fish Fertilizer and Plant Supplement, Great for Roots and Soil, Made from Sustainable Salmon, by Bloom City, 1/2 Pint (8 oz)

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#10

7.5 score

Slide 1

Lilly Miller

Lilly Miller 100099252 022671705008 Fertilizer, 1 Gallon, White

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Buying Guide for the Best Fish Fertilizer For Plants

Choosing the right fish fertilizer for your plants can significantly impact their growth and health. Fish fertilizers are organic and provide essential nutrients that promote strong root development, lush foliage, and vibrant blooms. When selecting a fish fertilizer, it's important to understand the key specifications and how they align with your gardening needs. This guide will help you navigate through the important aspects to consider, ensuring you pick the best product for your plants.
NPK RatioThe NPK ratio represents the proportions of nitrogen (N), phosphorus (P), and potassium (K) in the fertilizer. Nitrogen promotes leafy growth, phosphorus supports root and flower development, and potassium enhances overall plant health. For leafy vegetables, a higher nitrogen ratio (e.g., 5-1-1) is beneficial. For flowering plants, a balanced ratio (e.g., 2-3-1) is ideal. Choose an NPK ratio based on the specific needs of your plants to ensure they receive the right nutrients.
Form (Liquid or Granular)Fish fertilizers come in liquid or granular forms. Liquid fertilizers are fast-acting and easy to apply, making them suitable for quick nutrient uptake and foliar feeding. Granular fertilizers release nutrients slowly over time, providing a steady supply of nutrients. If you need immediate results or prefer foliar feeding, opt for liquid. For long-term feeding and ease of application, granular might be the better choice.
OdorFish fertilizers can have a strong odor due to their organic nature. Some products are deodorized to reduce the smell, making them more pleasant to use, especially in indoor or small garden spaces. If you are sensitive to smells or plan to use the fertilizer in areas where odor could be an issue, look for deodorized options or those specifically labeled as low-odor.
Organic CertificationOrganic certification ensures that the fish fertilizer is made from natural ingredients without synthetic additives. This is important for gardeners who prioritize organic practices and want to avoid chemicals. Look for certifications from reputable organizations to ensure the product meets organic standards. If maintaining an organic garden is important to you, choose a certified organic fish fertilizer.
Application MethodDifferent fish fertilizers have varying application methods, such as direct soil application, foliar spraying, or mixing with water. Consider how you prefer to apply the fertilizer and the convenience of the method. For example, foliar sprays are great for quick nutrient absorption, while soil applications provide a more gradual nutrient release. Choose a method that fits your gardening routine and the specific needs of your plants.
Nutrient ContentBeyond the basic NPK ratio, fish fertilizers can contain additional micronutrients like calcium, magnesium, and trace elements that are beneficial for plant health. These extra nutrients can help address specific deficiencies and promote overall plant vigor. If your plants have specific nutrient needs or you want to ensure a comprehensive nutrient supply, look for fish fertilizers with a broad spectrum of nutrients.

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