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Organic Plant Fertilizers

10 Best Organic Plant Fertilizers 2025 in the United States

#1

Winner

9.9 score

Miracle-Gro Fruit & Citrus Plant Food Spikes

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Miracle-Gro Fruit & Citrus Plant Food Spikes

Miracle-Gro

9.9 score

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Miracle-Gro Fruit & Citrus Plant Food Spikes are specifically designed for those looking to enhance the growth of their fruit, citrus, and palm trees. The spikes are easy to use, releasing nutrients directly into the root zone which promotes strong growth and lush foliage. This product is convenient because you only need to apply it once per season in both Spring and Fall, making it low-maintenance compared to other fertilizers that require more frequent applications.

Rating
9.9
Chosen by1,344
Release Rate
Application Method

Most important from
20621 reviews

Release Rate
Convenient application every 6 months fits well into routine yard care.
Application Method
The spikes are easy to use; just hammer them into the soil.
#2
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.

25%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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Miracle-Gro Shake 'N Feed All Purpose Plant Food is a versatile option for both in-ground and container plants. One of its key strengths is the inclusion of vital micronutrients which aid in growing stronger and more vibrant plants. The product boasts a long-lasting feeding capability of up to 3 months, making it convenient for gardeners who prefer less frequent fertilizing.

Rating
9.8
Application Method

Most important from
15095 reviews

Application Method
Easy to apply and works effectively, even for balcony gardens.
#3
9.5 score

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

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

FoxFarm

9.5 score

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The FoxFarm Fertilizer Soil Trio Liquid Nutrient includes three different products: Grow Big, Big Bloom, and Tiger Bloom. Each serves a distinct purpose in promoting plant growth. Grow Big is a liquid concentrate fertilizer that supports lush vegetative growth. Big Bloom is an organic plant food suitable for use every time you water, and Tiger Bloom is a phosphorus fertilizer designed to enhance fruit, flower, and bud development. All three products are designed to work together, providing comprehensive support for vigorous growth and abundant yield.

Rating
9.5
Source of Nutrients
Release Rate
Application Method

Most important from
23220 reviews

Source of Nutrients
Indoor plants are lush and thriving thanks to these nutrients.
Release Rate
Very little product goes a long way and lasts more than a whole season.
Application Method
Easy to mix and works great on plants.

Top 10 Best Organic Plant Fertilizers 2025 in the United States

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Southern Homewares

Diatomaceous Earth Food Grade (Fresh Water Type) 2lb Zipper Bag Codex DE (0.2)

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#1

Winner

9.9 score

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Miracle-Gro

Miracle-Gro Fruit & Citrus Plant Food Spikes

Source of Nutrients: natural ingredients
Release Rate: once per season
Application Method: spikes

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11% OFF

Chosen by 1344 this week

Sponsored

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Southern Homewares

Diatomaceous Earth Food Grade (Fresh Water Type) 2lb Zipper Bag Codex DE (0.2)

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#2

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
Micronutrient Content: vital micronutrients
Application Method: shake onto soil, work in lightly

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25% OFF
#3

9.5 score

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FoxFarm

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

N-P-K Ratio: Grow Big: balanced, Tiger Bloom: high phosphorus
Source of Nutrients: Organic certification, OMRI listing for Big Bloom
Application Method: Liquid form

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#4

9.2 score

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Miracle-Gro

Miracle-Gro Indoor Plant Food, Liquid Plant Food for Houseplants, Snake Plants, Peace Lilies, Flowers, Vegetables, Herbs and More, 8 oz., 2-Pack

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13% OFF
#5

8.9 score

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Espoma

Espoma Organic Berry-Tone 4-3-4 Natural & Organic Fertilizer and Plant Food for All Berries. 4 lb. Bag. Use for Planting & Feeding to Promote Bountiful Harvest - Pack of 2

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#6

8.6 score

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Espoma

Espoma Organic Plant-Tone 5-3-3 Natural & Organic All Purpose Plant Food; 36 lb. Bag; The Original Organic Fertilizer for All Flowers, Vegetables, Trees, and Shrubs

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#7

8.3 score

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Jobe's Organics

Jobe’s Organics Granular Garden Fertilizer, Easy Plant Care Fertilizer for Vegetable Gardens and Tomato Plants, 4 lbs Bag

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#8

8.0 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
#9

7.7 score

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Espoma

Espoma Organic 8 Ounce Concentrated Indoor! Plant Food - Indoor Plant Fertilizer for Large & Small Plants Like Pothos, Fiddle Leaf Fig, Monstera, Snake & Palms

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61% OFF
#10

7.4 score

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Espoma

Espoma Organic Citrus-Tone 5-2-6 Natural & Organic Fertilizer and Plant Food for All Citrus, Fruit, Nut & Avocado Trees; 4 lb. Bag. Promotes Vigorous Growth & Abundant Fruit

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Buying Guide for the Best Organic Plant Fertilizers

Choosing the right organic plant fertilizer can significantly impact the health and growth of your plants. Organic fertilizers are derived from natural sources and are an excellent choice for promoting sustainable gardening practices. When selecting an organic 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 essential specs to make an informed decision.
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, a balanced or higher phosphorus ratio (e.g., 5-10-5) is ideal. Choose a ratio based on the specific needs of your plants.
Source of NutrientsOrganic fertilizers can be derived from various natural sources such as compost, manure, bone meal, and seaweed. Each source has its unique benefits. For example, compost is excellent for improving soil structure, while bone meal is rich in phosphorus. Understanding the source helps you select a fertilizer that complements your soil type and plant requirements. If you prefer a specific nutrient source, look for fertilizers that highlight it on the label.
Release RateThe release rate indicates how quickly the nutrients become available to plants. Organic fertilizers can be slow-release or fast-release. Slow-release fertilizers provide a steady supply of nutrients over time, which is ideal for long-term plant health. Fast-release fertilizers offer immediate nutrient availability, suitable for plants needing a quick boost. Consider your gardening schedule and plant needs when choosing the release rate. For consistent growth, slow-release is generally preferred.
Soil pH CompatibilitySoil pH compatibility ensures that the fertilizer will work effectively with your soil's pH level. Most plants thrive in slightly acidic to neutral pH (6.0-7.0). Some organic fertilizers can alter soil pH, so it's important to choose one that matches or adjusts your soil pH to the desired level. Test your soil pH before selecting a fertilizer to ensure compatibility and optimal nutrient uptake by your plants.
Micronutrient ContentMicronutrients such as iron, zinc, and magnesium are essential for plant health, even though they are needed in smaller quantities compared to macronutrients. Some organic fertilizers include these micronutrients, which can prevent deficiencies and promote vigorous growth. If your plants show signs of micronutrient deficiencies (e.g., yellowing leaves), choose a fertilizer that includes these essential elements. Check the label for a comprehensive list of nutrients.
Application MethodThe application method refers to how the fertilizer is applied to the plants. Common methods include granular, liquid, and foliar sprays. Granular fertilizers are easy to apply and provide a slow release of nutrients. Liquid fertilizers offer quick absorption and are ideal for immediate nutrient needs. Foliar sprays are applied directly to the leaves for rapid uptake. Choose an application method that fits your gardening routine and the specific needs of your plants.

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