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Organic Slow Release Fertilizer

10 Best Organic Slow Release Fertilizer 2025 in the United States

Name: Jobe’s Organics Granular All Purpose Fertilizer, Easy Plant Care Fertilizer for Vegetables, Flowers, Shrubs, Trees, and Plants, 16 lbs Bag
Brand: Jobe's Organics
Price: 41.81 USD
Availability: InStock

From leading brands and best sellers available on the web.

Winner

Jobe's Organics

Jobe’s Organics Granular All Purpose Fertilizer, Easy Plant Care Fertilizer for Vegetables, Flowers, Shrubs, Trees, and Plants, 16 lbs Bag

9.9

score

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Osmocote

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 8 lb.

9.8

score

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Milorganite

Milorganite All-Purpose Eco-Friendly Slow-Release Nitrogen 6-4-0 Fertilizer, 32 Pound Bag - for Lawns, Flowers, and Gardens

9.5

score

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Down To Earth All Natural Fertilizers

Down to Earth Feather Meal 12-0-0, 50 lb. - for all types of growing plants, shoots, flowers, fruits and vegetables

9.2

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.

8.9

score

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Scotts

Scotts Rose & Bloom Continuous Release Plant Food, 3 lb

8.6

score

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Dr. Earth

Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Poly Bag

8.3

score

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Milorganite

Milorganite Recycled Lawn and Garden Nitrogen Fertilizer (Recycled Organic Material)

8.0

score

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Organic Plant Magic

Organic Plant Magic - Truly Organic™ Slow Release Granular Fertilizer : Long-Lasting Plant Food Granules - Indoor & Outdoor Flowers, Vegetable Gardens, Fruit Trees, Shrubs, House Plants [One 4 lb Bag]

7.7

score

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#10

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

7.4

score

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More products we considered

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

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Arber Organic Liquid Concentrate for Indoor and House Plants | Natural Gardening (Organic Disease & Insect Set)

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Arber Nutrition & Health Starter Set - Organic Plant Nourishment, Protection & Growth Boost - Liquid Concentrate for Gardens (Organic Protectant)

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𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 All-Purpose 20-20-20 Liquid Fertilizer Spray for Lawns, Grass, Plants, Vegetables, Fruits & Flowers | 20-20-20 Liquid Fertilizer for Indoor and Outdoor Plants (32 OZ)

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Humboldts Secret Calcium, Magnesium and Iron Supplement – Hydroponic Supplies – Liquid Nutrient Fertilizer – Supports Vegetative and Flowering Stage – 8 Ounce

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10 Best Organic Slow Release Fertilizer 2025 in the United States

Jobe’s Organics Granular All Purpose Fertilizer, Easy Plant Care Fertilizer for Vegetables, Flowers, Shrubs, Trees, and Plants, 16 lbs Bag

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 8 lb.

Milorganite All-Purpose Eco-Friendly Slow-Release Nitrogen 6-4-0 Fertilizer, 32 Pound Bag - for Lawns, Flowers, and Gardens

Down to Earth Feather Meal 12-0-0, 50 lb. - for all types of growing plants, shoots, flowers, fruits and vegetables

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.

Scotts Rose & Bloom Continuous Release Plant Food, 3 lb

Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Poly Bag

Milorganite Recycled Lawn and Garden Nitrogen Fertilizer (Recycled Organic Material)

Organic Plant Magic - Truly Organic™ Slow Release Granular Fertilizer : Long-Lasting Plant Food Granules - Indoor & Outdoor Flowers, Vegetable Gardens, Fruit Trees, Shrubs, House Plants [One 4 lb Bag]

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

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

Arber Organic Liquid Concentrate for Indoor and House Plants | Natural Gardening (Organic Disease & Insect Set)

Arber Nutrition & Health Starter Set - Organic Plant Nourishment, Protection & Growth Boost - Liquid Concentrate for Gardens (Organic Protectant)

𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 All-Purpose 20-20-20 Liquid Fertilizer Spray for Lawns, Grass, Plants, Vegetables, Fruits & Flowers | 20-20-20 Liquid Fertilizer for Indoor and Outdoor Plants (32 OZ)

Humboldts Secret Calcium, Magnesium and Iron Supplement – Hydroponic Supplies – Liquid Nutrient Fertilizer – Supports Vegetative and Flowering Stage – 8 Ounce

FAQ

What are the best organic slow-release fertilizers available?

How do I apply organic slow-release fertilizers to my garden?

Are organic slow-release fertilizers effective for all types of plants?

How do organic slow-release fertilizers compare to synthetic fertilizers?

Are organic slow-release fertilizers safe for pets and the environment?

10 Best Organic Slow Release Fertilizer 2025 in the United States

Jobe’s Organics Granular All Purpose Fertilizer, Easy Plant Care Fertilizer for Vegetables, Flowers, Shrubs, Trees, and Plants, 16 lbs Bag

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 8 lb.

Milorganite All-Purpose Eco-Friendly Slow-Release Nitrogen 6-4-0 Fertilizer, 32 Pound Bag - for Lawns, Flowers, and Gardens

Down to Earth Feather Meal 12-0-0, 50 lb. - for all types of growing plants, shoots, flowers, fruits and vegetables

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.

Humboldts Secret Tree Trunk - Silicate Additive - Advanced Nutrients - Helps Plants Flourish - Indoor Plant Food - Hydroponic Nutrients - Liquid Fertilizer (5 Gallon)

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 5 Gallons

Humboldts Secret Golden Tree: Best Plant Food for Plants & Trees - All-in-One Concentrated Additive - Vegetables, Flowers, Fruits, Lawns, Roses, Tomatoes & More (16 Ounce)

Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 8 Ounce

Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System (1 Gallon)

Scotts Rose & Bloom Continuous Release Plant Food, 3 lb

Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Poly Bag

Milorganite Recycled Lawn and Garden Nitrogen Fertilizer (Recycled Organic Material)

Organic Plant Magic - Truly Organic™ Slow Release Granular Fertilizer : Long-Lasting Plant Food Granules - Indoor & Outdoor Flowers, Vegetable Gardens, Fruit Trees, Shrubs, House Plants [One 4 lb Bag]

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

Organic Fertilizers

RAW Organic Fertilizers

Safer Organic Fertilizers

Slow Release Fertilizer For Flowers

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

Arber Organic Liquid Concentrate for Indoor and House Plants | Natural Gardening (Organic Disease & Insect Set)

Arber Nutrition & Health Starter Set - Organic Plant Nourishment, Protection & Growth Boost - Liquid Concentrate for Gardens (Organic Protectant)

𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 All-Purpose 20-20-20 Liquid Fertilizer Spray for Lawns, Grass, Plants, Vegetables, Fruits & Flowers | 20-20-20 Liquid Fertilizer for Indoor and Outdoor Plants (32 OZ)

Humboldts Secret Calcium, Magnesium and Iron Supplement – Hydroponic Supplies – Liquid Nutrient Fertilizer – Supports Vegetative and Flowering Stage – 8 Ounce

FAQ

What are the best organic slow-release fertilizers available?

How do I apply organic slow-release fertilizers to my garden?

Are organic slow-release fertilizers effective for all types of plants?

How do organic slow-release fertilizers compare to synthetic fertilizers?

Are organic slow-release fertilizers safe for pets and the environment?