10 Best Slow Release Fertilizer For Plants of 2025

Tested and Reviewed: Top 10 Slow Release Fertilizer For Plants deals with expert ratings from 8.1 to a perfect 10

April 2026 Edition

Editor's Choice

9.7

Save 14%

Osmocote

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor₁, Granular Fertilizer with 11 Essential Nutrients, 2 lbs.

14% Off

Editor's bottom line:

“This slow release fertilizer for plants is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor granular plant food contains 11 essential nutrients and feeds live plants up to 6 full months
This fertilizer works with virtually all plant varieties and growing conditions
Each granule is coated with a unique resin that controls nutritional release so plants get what they need when they need it
Osmocote offers a no-burn pledge, when used as directed
One 2 lb. container of Osmocote Smart-Release Plant Food Plus Outdoor & Indoor covers up to 75 sq. ft.

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Picked by 397 people today

9.5

Save 15%

Osmocote

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor₁, Granular Fertilizer with 11 Essential Nutrients, 8 lbs.

15% Off

Main Highlights

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor granular plant food contains 11 essential nutrients and feeds live plants up to 6 full months
This fertilizer works with virtually all plant varieties and growing conditions
Each granule is coated with a unique resin that controls nutritional release so plants get what they need when they need it
Osmocote offers a no-burn pledge, when used as directed
One 8 lb. container of Osmocote Smart-Release Plant Food Plus Outdoor & Indoor covers up to 300 sq. ft.

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9.5

Save 18%

Osmocote

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 lb.

18% Off

Main Highlights

Our best formula, fortified with 11 essential nutrients
Works with virtually all plant varieties, in all growing conditions
Feeds up to 6 full months
Apply with confidence to potted plants, indoors or outdoors
No-burn pledge when used as directed

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Best Value

9.2

Save 31%

Osmocote

Osmocote Smart-Release Plant Food Flower & Vegetable, 8 lb.

31% Off

Main Highlights

OSMOCOTES HIGHEST TOTAL NUTRIENT FORMULA: NPK = 14-14-14. Favored for seasonal vegetables and perennials. Promotes strong roots as well as vigorous and bountiful above-ground growth
OSMOCOTES DIRECTIONS FOR USE: 1 lb. covers 40 sq. ft. (approx. 6½ x 6½). Mix into 1 3 of soil. Applicator included. Apply to vegetable gardens and mulched areas around ornamental trees / shrubs, and raised beds
OSMOCOTE QUALITY: Osmocote is the original slow-release plant food. Decades of rigorous field testing confirm product effectiveness with hundreds of plant species in a variety of climate and soil conditions
OSMOCOTES SECRET: Soil temperature controls how Osmocote releases its nutrients, and importantly how nutrients are taken up by the plant. Replenishment and feeding are in natural harmony
OSMOCOTE IS MISTAKE-PROOF: Even if over-applied up to 3x the recommended rate, Osmocote does not burn the plant

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9.0

GARDENWISE

10-10-10 Plant Fertilizer Slow Release - 10 10 10 All Purpose Granular Garden Fertilizer for Vegetables, Tomato, Arborvitae, Shrubs, Rose, Flowers, Fruit, Fig Trees (1/2 Quart)

Main Highlights

Balanced 10-10-10 Granular Fertilizer for Outdoor & Indoor Plants: All-purpose plant food with 10% Nitrogen, 10% Phosphorus, and 10% Potassium. Perfect for outdoor vegetable gardens, fruit trees, evergreens, shrubs, lawns, and flowers. Also great for potted plants and indoor gardening. One solution for all your plant needs!
Slow-Release Formula for Continuous Outdoor Feeding: Provides up to 8 weeks of sustained nutrition with fewer applications. Ideal for outdoor lawns, vegetable gardens, fruit trees, and flowering plants. Apply twice per season for gardens and three times per year for trees and shrubs. Less work, more growth!
Promotes Strong Roots, Lush Growth, and Vibrant Outdoor Blooms: Phosphorus supports root health, Nitrogen fuels lush green leaves, and Potassium enhances plant resilience. Perfect for outdoor flowers, tomatoes, peppers, roses, evergreens, and shrubs. Enjoy thriving plants, colorful blooms, and abundant harvests!
Easy-to-Apply Granules for Even Outdoor Coverage: Fine granules spread evenly for maximum soil absorption in outdoor gardens, lawns, and landscapes. Ideal for pines, oaks, banana trees, fig trees, and ornamentals. Just spread, water, and watch your outdoor garden flourish!
Quick-Release Nitrogen for Immediate Outdoor Results: Instant nitrogen boost for rapid growth, combined with slow-release feeding for lasting results. Perfect for outdoor grass lawns, evergreen trees, flowering plants, and vegetables. See your outdoor garden thrive quickly and sustainably!

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8.8

Save 16%

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.

16% Off

Main Highlights

Miracle-Gro Shake 'N Feed All Purpose Plant Food feeds plants for up to 3 months, and nourishes above and below the soil
This plant food contains vital micronutrients to grow stronger, vibrant, and more productive plants (vs unfed plants)
Use this all-purpose plant food with most plants, whether indoor or outdoor container plants or in-ground plants, and most plant types, including flowers, vegetables, and herbs
Apply this garden product evenly onto the soil and work into the top 1-3 inches of soil for in-ground plants, or lightly work into the soil of established container plants; water to start feeding
Reapply Miracle-Gro Shake 'N Feed All Purpose Plant Food every 3 months and water regularly for a beautiful garden all season long
Contains natural ingredients that help feed and nourish above and below the soil

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8.6

Save 12%

GARDENWISE

10-10-10 Plant Fertilizer Slow Release - 10 10 10 All Purpose Granular Garden Fertilizer for Vegetables, Tomato, Arborvitae, Shrubs, Rose, Flowers, Fruit, Fig Trees (3 QUARTS)

12% Off

Main Highlights

Balanced 10-10-10 Granular Fertilizer for Outdoor & Indoor Plants: All-purpose plant food with 10% Nitrogen, 10% Phosphorus, and 10% Potassium. Perfect for outdoor vegetable gardens, fruit trees, evergreens, shrubs, lawns, and flowers. Also great for potted plants and indoor gardening. One solution for all your plant needs!
Slow-Release Formula for Continuous Outdoor Feeding: Provides up to 8 weeks of sustained nutrition with fewer applications. Ideal for outdoor lawns, vegetable gardens, fruit trees, and flowering plants. Apply twice per season for gardens and three times per year for trees and shrubs. Less work, more growth!
Promotes Strong Roots, Lush Growth, and Vibrant Outdoor Blooms: Phosphorus supports root health, Nitrogen fuels lush green leaves, and Potassium enhances plant resilience. Perfect for outdoor flowers, tomatoes, peppers, roses, evergreens, and shrubs. Enjoy thriving plants, colorful blooms, and abundant harvests!
Easy-to-Apply Granules for Even Outdoor Coverage: Fine granules spread evenly for maximum soil absorption in outdoor gardens, lawns, and landscapes. Ideal for pines, oaks, banana trees, fig trees, and ornamentals. Just spread, water, and watch your outdoor garden flourish!
Quick-Release Nitrogen for Immediate Outdoor Results: Instant nitrogen boost for rapid growth, combined with slow-release feeding for lasting results. Perfect for outdoor grass lawns, evergreen trees, flowering plants, and vegetables. See your outdoor garden thrive quickly and sustainably!

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8.3

Bigmeta

10-10-10 Slow-Release Premium Fertilizer - All-Purpose Plant Food for Indoor Outdoor Gardening Vegetables Flowers Lawn Trees Shrubs, 0.5 Quart

Main Highlights

SAFE AND RELIABLE INGREDIDENTSTired of harsh chemical odors and potential leaf burn? Our 10-10-10 fertilizer is crafted from premium natural ingredients, ensuring a safe environment for your family and pets while delivering professional-grade nutrients to your soil
SMART SLOW-RELEASE TECHNOLOGY Stop the endless cycle of weekly feeding. Our advanced granular formula provides a steady stream of nutrition for up to 8 weeks. This gradual release prevents the "nutrient spike" that often leads to root burn in traditional fertilizers, making it perfect for delicate seedlings and seasonal shrubs
BALANCED NPK FOR VIBRANT GROWTH Featuring a precise 10% Nitrogen for lush green foliage, 10% Phosphorus for vigorous root development, and 10% Potassium for plant disease resistance. It's the essential "multi-vitamin" your garden needs for the spring growing season
VERSATILE OUTDOOR & INDOOR USE Designed for the modern gardener. Whether you're feeding vegetables, flowers, shrubs, or fruit trees, or maintaining indoor monstera and other potted plants, this all-purpose plant food ensures consistent results across all plant varieties
GARDENER'S TRUSTED CHOICE Packaged in a convenient resealable container for easy storage. Ideal for home gardening enthusiasts who demand quality without waste

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8.1

GARDENWISE

10-10-10 Plant Fertilizer Slow Release - 10 10 10 All Purpose Granular Garden Fertilizer for Vegetables, Tomato, Arborvitae, Shrubs, Rose, Flowers, Fruit, Fig Trees (2 QUARTS)

Main Highlights

Balanced 10-10-10 Granular Fertilizer for Outdoor & Indoor Plants: All-purpose plant food with 10% Nitrogen, 10% Phosphorus, and 10% Potassium. Perfect for outdoor vegetable gardens, fruit trees, evergreens, shrubs, lawns, and flowers. Also great for potted plants and indoor gardening. One solution for all your plant needs!
Slow-Release Formula for Continuous Outdoor Feeding: Provides up to 8 weeks of sustained nutrition with fewer applications. Ideal for outdoor lawns, vegetable gardens, fruit trees, and flowering plants. Apply twice per season for gardens and three times per year for trees and shrubs. Less work, more growth!
Promotes Strong Roots, Lush Growth, and Vibrant Outdoor Blooms: Phosphorus supports root health, Nitrogen fuels lush green leaves, and Potassium enhances plant resilience. Perfect for outdoor flowers, tomatoes, peppers, roses, evergreens, and shrubs. Enjoy thriving plants, colorful blooms, and abundant harvests!
Easy-to-Apply Granules for Even Outdoor Coverage: Fine granules spread evenly for maximum soil absorption in outdoor gardens, lawns, and landscapes. Ideal for pines, oaks, banana trees, fig trees, and ornamentals. Just spread, water, and watch your outdoor garden flourish!
Quick-Release Nitrogen for Immediate Outdoor Results: Instant nitrogen boost for rapid growth, combined with slow-release feeding for lasting results. Perfect for outdoor grass lawns, evergreen trees, flowering plants, and vegetables. See your outdoor garden thrive quickly and sustainably!

Show Price

Our Best Overall Choice

Best Choice

9.7

Osmocote

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor₁, Granular Fertilizer with 11 Essential Nutrients, 2 lbs.

14% Off

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor granular plant food contains 11 essential nutrients and feeds live plants up to 6 full months
This fertilizer works with virtually all plant varieties and growing conditions
Each granule is coated with a unique resin that controls nutritional release so plants get what they need when they need it
Osmocote offers a no-burn pledge, when used as directed
One 2 lb. container of Osmocote Smart-Release Plant Food Plus Outdoor & Indoor covers up to 75 sq. ft.

Show Price

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