Fertilizers & Treatments

Whether you're looking to have the perfect lawn or plant a large garden that thrives with a minimal amount of effort, A.M. Leonard has the fertilizers and treatments you need, including slow-release and organic fertilizers and rooting hormones.

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Items 1-24 of 202

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  1. Image 1 of the Osmocote 14-14-14 Slow Release Fertilizer
    Rating:
    98%
    Osmocote 14-14-14 Slow-Release Fertilizer, 3 to 4 Month, 50lb Bag
    $128.92
  2. Image 1 of the Osmocote Fertilizer 15-9-12 Slow Release 3 to 4 Months 50lb Bag
    Rating:
    100%
    Osmocote Plus 15-9-12 Slow-Release Fertilizer, 3 to 4 Month, 50lb Bag
    $139.86
  3. Agriform 20-10-5 Fertilizer Tablets, 2 Year Formula, Box
    Rating:
    100%
    Agriform 20-10-5 Fertilizer Tablets, 2 Year Formula, Box
    $102.24
  4. Image 1 of the Florikan® 17-5-11 NPK Max, 140-Day Formula
    Rating:
    95%
    NPK Max 17-5-11 Fertilizer, 140-Day Formula by Florikan
    $125.46
  5. Image 1 of the Osmocote 19-5-8 Slow Release Fertilizer
    Rating:
    100%
    Osmocote Blend 19-5-8 Slow-Release Fertilizer, 8 to 9 Month, 50lb Bag
    $137.45
  6. Image 1 of the Peters Peat Lite Special Fertilizer, 20-10-20
    Rating:
    100%
    Fertilizer, Peat-Lite Special 20-10-20 by Peters Professional
    $60.89
  7. Image 1 of the Agriform Fertilizer Tablets 21 Gram 20-10-5 2 Year Release 500 per Case
    Rating:
    100%
    Fertilizer Tablets, 21g, 20-10-5, 2-Year Release, Case of 500 by Agriform
    $102.24
  8. Image 1 of the Agriform Fertilizer Tablets 10 Gram 20-10-5 2 Year Release 1000 per Case
    Rating:
    100%
    Fertilizer Tablets, 10g, 20-10-5, 2-Year Release, Case of 1000 by Agriform
    $117.77
  9. Image 1 of the Leonard 10-10-10 Tree Food for Evergreens and General Use, Box of 40 Stakes
    Rating:
    93%
    Fertilizer Stakes, 10-10-10 Formula for Evergreens and General Use, Box Of 40 Stakes by A.M. Leonard
    $55.81
  10. Image 1 of the Osmocote Fertilizer 15-9-12 Slow Release 5 to 6 Months 50lb Bag
    Rating:
    100%
    Osmocote Fertilizer 15-9-12 Slow Release 5 to 6 Months 50lb Bag
    $143.45
  11. Image 1 of the Peters Professional General Purpose Fertilizer, 20-20-20
    Rating:
    93%
    Fertilizer, General Purpose 20-20-20 Formula by Peters Professional
    $68.32
  12. Image 1 of the Osmocote 18 6 12 Slow Release Fertilizer
    Rating:
    100%
    Osmocote 18-6-12 Slow-Release Fertilizer
    $141.91
  13. Image 1 of the Leonard 15-7-6 Tree Food for Trees and Shrubs, Box of 40 Stakes
    Rating:
    100%
    Fertilizer Stakes, 15-7-6 Formula for Trees and Shrubs, Box Of 40 Stakes by A.M. Leonard
    $55.81
  14. Image 1 of the The Andersons® Humic DG Granular Soil Conditioner (Humic Acid), 40lb Bag
    Rating:
    96%
    Soil Conditioner, Granular Humic DG (Humic Acid) by The Andersons
    $66.16
  15. Image 1 of the Leonard 8-16-16 Tree Food for Fruit and Ornamental Trees, Box of 40 Stakes
    Rating:
    100%
    Fertilizer Stakes, 8-16-16 Formula for Fruit and Ornamental Trees, Box Of 40 Stakes by A.M. Leonard
    $55.81
  16. Image 1 of the Florikan 14 14 14 NPK 90 Day Formula
    Rating:
    100%
    Fertilizer, 14-14-14 NPK, 90-Day Formula by Florikan
    $131.41
  17. Image 1 of the Terra-Sorb Hydrogel - Horticultural Grade - Bulk Sizes
    Rating:
    100%
    Terra-Sorb Hydrogel - Horticultural Grade - Bulk Sizes
    $116.59
  18. Image 1 of the Florikan 20 4 9 NPK Plus 180 Day Formula
    Rating:
    100%
    Fertilizer, 20-4-9 NPK Plus, 180-Day Formula, 50lb Bag by Florikan
    $141.96
  19. Wilt-Pruf Anti-Transpirant Spray
    Rating:
    96%
    Wilt-Pruf Anti-Transpirant Spray
    $20.04
  20. Image 1 of the Peters Peat Lite Blossom Booster Fertilizer, 10-30-20
    Rating:
    100%
    Fertilizer, 10-30-20 Peat Lite Blossom Booster, 25-Pound Bag by Peters Professional
    $79.75
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A.M. Leonard knows you want to grow the healthiest and most beautiful plants and lawn possible. When plants are at their healthiest, they reach their full size, greatest strength, and biggest yield. Our fertilizers, treatments, and plant food helps lawns and plants grow big, strong, and green as can be. Healthy plants simply look the best. They have the largest, most beautiful flowers and vibrant green leaves. They are the tallest trees that produce the most and best-tasting fruit. With strong roots and stems, healthy plants are also more resistant to anything that might harm them. No matter if you‘re growing a tree, a vegetable, or a flower, we have the plant food you need.

Slow-release fertilizers such as the Osmocote 14-14-14 are very popular products, offering a wide range of uses from greenhouse to planter and cutting down labor with their time-release formulas. We also carry plant and flower fertilizers including brands such as BioPlex and Grotab, lawn and grass fertilizers, and organic options as well. And when your plants and yards begin to thrive, keep it that way with our herbicides, fungicides, and insecticides.

If you're just getting started or preparing for your next task, we carry a range of greenhouse supples including grow lights and seed starting supplies, as well as nursery supplies including a variety of pots and ground cover options.