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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  1. Image 1 of the Osmocote 14-14-14 Slow Release Fertilizer
    Rating:
    100%
    Osmocote 14-14-14 Slow-Release Fertilizer, 3 to 4 Month, 50lb Bag
    $125.78
  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
    $136.45
  3. 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
    $134.10
  4. Image 1 of the Osmocote Fertilizer 15-9-12 Slow Release 8 to 9 Months 50lb Bag
    Rating:
    100%
    Osmocote Plus 15-9-12 Slow-Release Fertilizer, 8 to 9 Month, 50lb Bag
    $140.50
  5. 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
    $54.45
  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
    $59.40
  7. 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
    $139.95
  8. 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
    $54.45
  9. Image 1 of the Peters Professional General Purpose Fertilizer, 20-20-20
    Rating:
    93%
    Fertilizer, General Purpose 20-20-20 Formula by Peters Professional
    $66.65
  10. 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
    $64.55
  11. Wilt-Pruf Anti-Transpirant Spray
    Rating:
    96%
    Wilt-Pruf Anti-Transpirant Spray
    $19.55
  12. Image 1 of the Florikan 12 4 11 NPK Plus with CaNO3 180 Day Formula
    Rating:
    100%
    Fertilizer, 12-4-11 NPK Plus with CaNO3, 180-Day Formula by Florikan
    $144.40
  13. Image 1 of the Terra-Sorb Hydrogel - Fine Grade
    Rating:
    100%
    Terra-Sorb Hydrogel - Fine Grade
    $109.98
  14. Fairlawn Blue and Rye Mix
    Rating:
    100%
    Fairlawn Blue and Rye Mix
    $39.75
  15. Image 1 of the ROOTS Healthy Start Advanced 3-4-3
    Rating:
    100%
    Healthy Start Advanced MRT Fertilizer, 3-4-3 with Mycorrhizal Fungi, 25lb Bag by Roots
    $60.20
  16. Image 1 of the PennMulch Seed Accelerator, 40 Pound Bag
    Rating:
    100%
    Penn Mulch, 40-Pound Bag
    $37.65
  17. Image 1 of the The Andersons 22-0-4 Turf Fertilizer with Trimec Post-Emergent Herbicide, 40lb Bag
    Rating:
    100%
    Fertilizer, 22-0-4 Turf Fertilizer with Trimec Post-Emergent Herbicide, 40lb Bag by The Andersons
    $48.75
  18. Image 2 of the PHC ROOTS Plant Food with Microbes, 7-7-7, 40lb Bag
    Rating:
    100%
    Fertilizer/Plant Food, 7-7-7 NPK with Microbes, 40lb Bag by PHC
    $83.38
  19. Image 1 of the Neptunes Harvest Organic Fish and Seaweed Blend Fertilizer
    Rating:
    100%
    Neptunes Harvest Organic Fish and Seaweed Blend Fertilizer
    $23.76
  20. Image 1 of the Innova 7 1 2 Organic Fertilzer 40 Pound Bag
    Rating:
    100%
    Organic Fertilizer, 7-1-2, 40lb Bag by Innova
    $55.95
  21. Image 1 of the Fairlawn Blue and Rye Mix 5 Lb Bag
    Rating:
    100%
    Fairlawn Blue and Rye Mix, 5 Lb Bag
    $39.75
  22. Neptunes Harvest 5 3 0 Crab and Lobster Shell Meal
    Rating:
    100%
    Neptunes Harvest 5 3 0 Crab and Lobster Shell Meal
    $18.67
  23. Image 1 of the Neptunes Harvest 5 3 0 Crab and Lobster Shell Meal 4 Pound Bag
    Rating:
    100%
    Neptune's Harvest 5-3-0 Crab & Lobster Shell Meal, 4-Pound Bag
    $18.67
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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.