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Osmocote 18-6-12 Slow-Release Fertilizer

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Osmocote 19-5-8 Slow Release Fertilizer


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# 18612
Out of Stock Please call for availability
Weight: 50.00 lbs

A single application lasts the entire season!

This slow-release Osmocote fertilizer features an 18-6-12 formulation. Multiple layers of polymeric resin encapsulate the water-soluble nutrients in this fertilizer. This bag contains 50 pounds of fertilizer.

Osmocote 18-6-12 Slow-Release Fertilizer is excellent propagation and fall feeding. Its 3:1:2 ratio makes it ideal for greenhouse and container nursery stock. The polymeric resin coating protects the nutrient core. When water vapor eventually penetrates this shell, it dissolves the core into the surrounding soil/media. See below for application rates.

This Osmocote fertilizer is the industry standard in controlled-release nutrition. Its unique blend of nutrients helps deliver bigger, greener plants. A single application lasts 8 to 9 months for an extended growing season in warmer areas!


  • Guaranteed analysis: Nitrogen (18%), phosphorus (6%), and potassium (12%)
  • Format: Granular
  • Bag weight (pounds): 50

Product Features

  • Slow-release fertilizer
  • Granular format
  • Polymeric resin coating

Product Benefits

  • A single application lasts 8 to 9 months
  • Excellent for propagation and fall feeding
  • Ideal ratio for greenhouse and container nursery stock
  • Industry standard in controlled-release nutrition
  • Helps deliver bigger, greener plants

Application Rates

Soil incorporation: Mix a minimum of 6 pounds of Osmocote per cubic yard of material

Topdressing: Mix 2 to 4 pounds per 100 square feet

Topdressing in containers:
  • 1-gallon containers - 9 to 18 grams
  • 2-gallon containers - 19 to 39 grams
  • 3-gallon containers - 34 to 68 grams
  • 5-gallon containers - 54 to 109 grams
  • 7-gallon containers - 78 to 156 grams

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