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Organic Garden Fertilizers

10 Best Organic Garden Fertilizers 2025 in the United States

#1

Winner

9.8 score

Miracle-Gro Shake 'N Feed All Purpose Plant Food, For In-Ground and Container Plants, Feeds for up to 3 Months, 4.5 lbs.

26%OFF

Miracle-Gro Shake 'N Feed All Purpose Plant Food, For In-Ground and Container Plants, Feeds for up to 3 Months, 4.5 lbs.

Miracle-Gro

9.8 score

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The Miracle-Gro Shake 'N Feed All Purpose Plant Food is a versatile product suitable for a variety of plants, both in-ground and container-based. Its strength lies in its ability to feed plants for up to 3 months, which reduces the frequency of reapplication and ensures consistent nourishment. The inclusion of vital micronutrients helps in producing stronger and more vibrant plants, which is a major plus for any gardener aiming for a healthy garden.

Rating
9.8
Chosen by1,279
Soil Condition
Application Method

Most important from
15437 reviews

Soil Condition
This fertilizer works wonders, especially in challenging conditions like a balcony garden.
Application Method
Easy to apply and ensures healthy plant growth, making it a great value for the price.
#2
9.6 score

FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)

5%OFF

FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)

FoxFarm

9.6 score

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The FoxFarm Fertilizer Soil Trio, which includes Tiger Bloom, Grow Big, and Big Bloom, is designed to support robust plant growth and development. The trio provides a well-rounded nutrient profile suitable for various plants, with each product serving specific growth phases. Grow Big focuses on vegetative growth, Tiger Bloom aids in flowering and fruiting with its higher phosphorus content, and Big Bloom can be used consistently for plant health.

Rating
9.6
Source of Nutrients
Release Rate
Application Method

Most important from
23283 reviews

Source of Nutrients
These nutrients were purchased for indoor plants to grow during extreme weather. They are very lush and thriving thanks to these plant vitamins and minerals.
Release Rate
Very little goes a long way and I only have to feed them about twice a week. This supply will last more than a whole season.
Application Method
Easy to mix and works great for me on my plants.
#3
9.3 score

FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0.01-0.03-0.7 (Pint)

FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0.01-0.03-0.7 (Pint)

FoxFarm

9.3 score

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FoxFarm Big Bloom Plant Food stands out as an organic liquid fertilizer designed to enhance the growth and flavor of flowers, fruits, and vegetables. Its notable strength lies in its unique formulation that includes earthworm castings and bat guano, offering a rich array of nutrients without harmful chemicals. This makes it suitable for gardeners prioritizing a natural approach to plant care.

Rating
9.3
N-P-K Ratio
Source of Nutrients
Release Rate

Most important from
10904 reviews

N-P-K Ratio
Despite its low N-P-K ratio, this fertilizer is packed with natural goodness, bolstering root development and plant health without risking nutrient burn.
Source of Nutrients
Big Bloom's natural ingredients, like bat guano and earthworm castings, enrich the soil and support beneficial microorganisms, leading to more robust plant growth.
Release Rate
Regular use can yield potent results, especially when used correctly with a consistent feeding schedule, showing visible effects sometimes overnight.
Soil Condition
For optimal results, it's essential to follow the dilution instructions and incorporate a flushing routine to prevent salt buildup in the soil.
Plant Type
FoxFarm Big Bloom is a game-changer for gardeners, offering versatility and reliability for a wide range of plants, from flowers to fruits and vegetables.
Application Method
The ease of use is a standout feature, with clear instructions and straightforward application that make it accessible for gardeners of all levels.

Top 10 Best Organic Garden Fertilizers 2025 in the United States

#1

Winner

9.8 score

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Miracle-Gro

Miracle-Gro Shake 'N Feed All Purpose Plant Food, For In-Ground and Container Plants, Feeds for up to 3 Months, 4.5 lbs.

Source of Nutrients: natural ingredients
Release Rate: up to 3 months
Plant Type: flowers, vegetables, herbs
Application Method: granule form

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26% OFF

Chosen by 1279 this week

#2

9.6 score

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FoxFarm

FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)

Source of Nutrients: OMRI listed, CDFA certified
Soil Condition: Organic
Plant Type: Various plants
Application Method: Mix with water, apply

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5% OFF
#3

9.3 score

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FoxFarm

FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0.01-0.03-0.7 (Pint)

N-P-K Ratio: 0.01-0.03-0.7
Source of Nutrients: earthworm castings, bat guano
Release Rate: slow
Plant Type: variety of plants
Application Method: mix with water

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#4

9.0 score

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Miracle-Gro

Miracle-Gro Shake 'N Feed Tomato, Fruit and Vegetable Plant Food, For In-Ground and Container Plants, Feeds up to 3 Months, 4.5 lbs.

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23% OFF
#5

8.7 score

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Espoma

Espoma Organic Plant-Tone 5-3-3 Natural & Organic All Purpose Plant Food; 4 lb. Bag; The Original Organic Fertilizer for All Flowers, Vegetables, Trees, and Shrubs. - Pack of 2

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17% OFF

Related Products

#6

8.5 score

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Espoma

Espoma Organic Garden-Tone 3-4-4 Organic Fertilizer for Cool & Warm Season Vegetables and Herbs. Grow an Abundant Harvest of Nutritious and Flavorful Vegetables – 4 lb. Bag

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#7

8.2 score

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Miracle-Gro

Miracle-Gro Performance Organics All Purpose Plant Nutrition Granules - 2.5 lb., All-Purpose Plant Food for Vegetables, Flowers and Herbs, Feeds up to 240 sq. ft.

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#8

7.9 score

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FoxFarm

FoxFarm Grow Big Hydro Liquid Fertilizer, Plant Food with Micro Nutrients for Hydroponic Systems - Enhances Vegetative Growth, Flowering, and Fruiting - pH Adjustable, NPK 3-2-6 (Pint)

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#9

7.6 score

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Jobe's Organics

Jobe’s Garden Fertilizer Spikes, Organic Fertilizer for Azaleas, Camellias, Rhododendrons, and Other Acid Loving Plants, 10 Count

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#10

7.3 score

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Espoma

Espoma Organic Grow! Liquid Concentrate Plant Food - All Purpose Fertilizer for Indoor & Outdoor Plants. for Organic Gardening. 16oz Bottle Pack of one

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Buying Guide for the Best Organic Garden Fertilizers

Choosing the right organic garden fertilizer is crucial for the health and productivity of your plants. Organic fertilizers are derived from natural sources and help improve soil structure, provide essential nutrients, and promote beneficial microbial activity. When selecting an organic fertilizer, it's important to consider the specific needs of your plants, the condition of your soil, and the type of garden you have. Understanding the key specifications of organic fertilizers will help you make an informed decision and ensure your garden thrives.
N-P-K RatioThe N-P-K ratio represents the percentage of nitrogen (N), phosphorus (P), and potassium (K) in the fertilizer. Nitrogen promotes leafy growth, phosphorus supports root development and flowering, and potassium enhances overall plant health. For leafy vegetables, a higher nitrogen content (e.g., 10-5-5) is beneficial. For flowering plants and root crops, a balanced or higher phosphorus and potassium ratio (e.g., 5-10-10) is ideal. Choose a fertilizer with an N-P-K ratio that matches the specific needs of your plants.
Source of NutrientsOrganic fertilizers can be derived from various natural sources such as compost, manure, bone meal, blood meal, and seaweed. Each source has different nutrient profiles and benefits. For example, compost is a well-rounded option that improves soil structure, while bone meal is high in phosphorus, making it great for root development. Consider the nutrient needs of your plants and the benefits of each source when selecting a fertilizer.
Release RateThe release rate of a fertilizer indicates how quickly the nutrients become available to plants. Slow-release fertilizers provide a steady supply of nutrients over time, which is ideal for long-term plant health and reducing the risk of nutrient burn. Fast-release fertilizers offer immediate nutrient availability, which can be beneficial for quick growth spurts or correcting nutrient deficiencies. Choose a release rate that aligns with your gardening goals and the specific needs of your plants.
Soil ConditionThe condition of your soil plays a significant role in determining the type of fertilizer you need. Conduct a soil test to identify any nutrient deficiencies or imbalances. For sandy soils, which drain quickly, a fertilizer with higher organic matter content can help retain moisture and nutrients. For clay soils, which retain water, a fertilizer that improves aeration and drainage is beneficial. Tailor your fertilizer choice to address the specific needs of your soil.
Plant TypeDifferent plants have varying nutrient requirements. Vegetables, flowers, shrubs, and trees all have unique needs. For example, fruiting plants like tomatoes and peppers benefit from higher phosphorus levels, while leafy greens like lettuce and spinach thrive with more nitrogen. Research the specific nutrient needs of the plants in your garden and choose a fertilizer that caters to those requirements.
Application MethodOrganic fertilizers come in various forms, including granular, liquid, and powder. Granular fertilizers are easy to apply and provide a slow, steady release of nutrients. Liquid fertilizers offer quick nutrient absorption and are ideal for foliar feeding or addressing immediate deficiencies. Powdered fertilizers can be mixed with water for a customizable application. Consider the ease of use and the specific needs of your garden when selecting an application method.

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