Best Slow-release Fertilizer For Flowers

Peter | 10-07-2025

With so many Best Slow-release Fertilizer For Flowers brands on the market – from big names like Osmocote,Schultz to smaller companies – finding the right product can be a real challenge. But we’re here to make your search easier.

We carefully researched and tested a vast range of Best Slow-release Fertilizer For Flowers to help you discover the top contenders that match different needs and preferences. Altogether, we spent over 100 hours evaluating numerous products first-hand.

Our #1 best Best Slow-release Fertilizer For Flowers is Osmocote Best Slow-release Fertilizer For Flowers, based on its stellar performance across all our tests. Below you’ll find more of our top-rated recommendations for great Best Slow-release Fertilizer For Flowers options currently available. Make sure to check out our buying guide too – it’s full of expert advice for choosing a Best Slow-release Fertilizer For Flowers tailored to exactly what you’re looking for. With our help guiding your decision, finding your perfect fit will be a breeze!

Editor's Choice
Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 lb.
Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 lb.
Premium Pick
Osmocote Smart-Release Plant Food Flower & Vegetable, 8 lb.
Osmocote Smart-Release Plant Food Flower & Vegetable, 8 lb.
Budget Pick
Schultz 018065 Spf48270 Slow-Release Bloom Fertilizer 3.5 Lbs, 56 Ounce
Schultz 018065 Spf48270 Slow-Release Bloom Fertilizer 3.5 Lbs, 56 Ounce

Top 8 Best Slow-release Fertilizer For Flowers

We researched and compared the top products in the Best Slow-release Fertilizer For Flowers category to provide you with these recommendations.

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

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 lb.
9.8

Osmocote

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  • 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

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

Osmocote Smart-Release Plant Food Flower & Vegetable, 8 lb.
9.8

Osmocote

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  • 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. 6 x 6). 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

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

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor₁, Granular Fertilizer with 11 Essential
9.1

Osmocote

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  • 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.

4. Schultz 018065 Spf48270 Slow-Release Bloom Fertilizer 3.5 Lbs, 56 Ounce

Schultz 018065 Spf48270 Slow-Release Bloom Fertilizer 3.5 Lbs, 56 Ounce
9.5

Schultz

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  • 12-24-12
  • Size: 3.5 Lbs
  • Slow Release
  • Easy To Use, No Mixing Required

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

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor₁, Granular Fertilizer with 11 Essential
8.5

Osmocote

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  • 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.

6. Osmocote 4 Month 14-14-14 Slow Release Vegetable & Flower Plant Food Fertilizer, 2 Lbs. - Pack of

Osmocote 4 Month 14-14-14 Slow Release Vegetable & Flower Plant Food Fertilizer, 2 Lbs. - Pack of
8.5

Osmocote

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  • Slow Release Plant Food for Flower & Vegetables. , 2 Lb Canister
  • Slow Release
  • Great for Vegetables and Flowers , Annuals and Perennials
  • Feeds Up to 4 Full Months
  • Apply with confidence

7. 10-10-10 Plant Fertilizer Slow Release – 10 10 10 All Purpose Granular Garden Fertilizer for Fruit

10-10-10 Plant Fertilizer Slow Release – 10 10 10 All Purpose Granular Garden Fertilizer for Fruit
8.3

Gardenwise

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  • 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!

8. Schultz Spf48410 Rose & Flower Slow-Release Plant Food, 15-5-15, 3.5 Lbs

Schultz Spf48410 Rose & Flower Slow-Release Plant Food, 15-5-15, 3.5 Lbs
8.9

Schultz

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  • 15-5-15
  • Size: 3.5 lbs
  • Slow release
  • Easy to use, no mixing is required
  • Includes micronutrients

Peter

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