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Osmocote 19-5-8 Slow Release Fertilizer

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$ 88.19
> 5
$ 85.89
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# 1958
In Stock
Weight: 50.00 lbs

Fortified with STEP Hi-Mag Nutrients!

This Osmocote fertilizer blend contains nitrogen (19%), phosphorus (5%), and potassium (8%) along with high amounts of magnesium (1.5%) and sulfur (8.1%). Osmocote fortifies this fertilizer with STEP Hi-Mag micronutrients. This slow-release fertilizer is water-soluble. Each bag contains 50 pounds of fertilizer.

Osmocote 19-5-8 is great for general purpose outdoor production. It offers a consistent release over 8 to 9 months and across a wide range of temperatures. Its dual-coated design reduces nitrogen leeching and decomposes with minimal environmental impact. You can incorporate 19-5-8 directly into the growing media or apply it as a top dress. See application rates below.

Osmocote designed this fertilizer to be both effective and affordable. It delivers nutrients in a highly efficient manner. This process results in robust growth and maximum yields.


  • Guaranteed analysis: Nitrogen (19.00%), phosphorus (5.00%), potassium (8.00%), magnesium (1.50%), calcium (1.60%), sulfur (8.10%), iron (1.00%), copper (0.06%), and zinc (0.13%)
  • Bag weight (pounds): 50
  • Release time (months): 8 to 9

Product Features

  • General purpose fertilizer
  • Slow release
  • Water soluble nutrients
  • Fortified with STEP Hi-Mag micronutrients

Product Benefits

  • Affordable and efficient
  • Ideal for general-purpose outdoor production
  • Dual coating reduces nitrogen leeching and decomposes with minimal environmental impact
  • Highly efficient nutrient delivery results in robust growth and maximize yields

Application Rates

Incorporation: Mix 3.6 to 7.7 ounces of fertilizer per cubic foot of growing medium

Container incorporation:
1-gallon - 9 to 20 grams
2-gallon - 19 to 42 grams
3-gallon - 34 to 74 grams
5-gallon - 54 to 118 grams
7-gallon - 78 to 169 grams.

Topdressing: Apply 2 to 4 pounds per 100 square feet

Review Summary (Based on 2 Reviews)

5 Stars

9 mo release wrote

Osmocote is a favorite and 9 mo release, even better, + the big bag saves on cost.

5 Stars

Slow Release Fertilizer by Osmocote wrote

This is a great fertilizer for southern climates and use on trees and shrubs for all seasons. It effectively provides nutrition for all plantings while limiting shock like many products that are quick release.

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