Skip to content
  • 🔥 Snap up amazing deals on gifts and 🌟Featured Items🌟!🔥
  • 🔥 Snap up amazing deals on gifts and 🌟Featured Items🌟!🔥
Outdoor Garden StoreOutdoor Garden Store
    • No products in the cart.

      Return to shop

  • Cart

    No products in the cart.

    Return to shop

  • Nursery Supplies
    • Nursery Pots
    • Plant Supports
    • Weed Control
    • Ground Cover
    • Soilless Mix
  • Herbicide Insecticide & Fungicide
    • Insecticides
    • Post-Emergent Herbicides
    • Fungicides
    • Arbor care
    • Herbicide Surfactants
    • Pre-Emergent Herbicides
    • Pond Supplies
    • Lawn Weed Control
  • Greenhouse Supplies
    • Greenhouse Accessories
    • Greenhouse Plastic & Poly Film
    • Seed Trays
    • Hydroponic Supplies
    • Seed Starting Supplies
    • Shade Cloth & Fabric
    • Grow Lights & Accessories
    • Plant Covers
  • Field Production
    • Tying & Securing
    • Burlap
    • Field Staking
    • Baskets
    • Tree Guards & Wraps
    • Grafting Tools & Supplies
    • Orchard & Harvesting
    • Tree Shelters
  • Fertilizers & Treatments
    • Soil Amendments
    • Slow Release Fertilizer
    • Lawn & Grass Fertilizer
    • Organic Fertilizer
    • Water Soluble Fertilizer
    • Plant and Flower Fertilizer
    • Rooting Hormone
    • Anti-Transpirant
Fertilizers & Treatments / Slow Release Fertilizer
Sale!
Osmocote 19-5-8 Slow Release Fertilizer

Osmocote 19-5-8 Slow Release Fertilizer

$134.10 Original price was: $134.10.$93.87Current price is: $93.87.

SKU: YW1SZ 571516723 Categories: Fertilizers & Treatments, Slow Release Fertilizer
  • Get Quality, Get More
  • Elevate Your Shopping Experience
  • Expertly Sourced, Quality Guaranteed
  • Secure Payments, Secure Shopping
Browse
  • Fertilizers & Treatments
    • Anti-Transpirant
    • Lawn & Grass Fertilizer
    • Organic Fertilizer
    • Plant and Flower Fertilizer
    • Rooting Hormone
    • Slow Release Fertilizer
    • Soil Amendments
    • Water Soluble Fertilizer
  • Field Production
    • Baskets
    • Burlap
    • Field Staking
    • Grafting Tools & Supplies
    • Orchard & Harvesting
    • Tree Guards & Wraps
    • Tree Shelters
    • Tying & Securing
  • Greenhouse Supplies
    • Greenhouse Accessories
    • Greenhouse Plastic & Poly Film
    • Grow Lights & Accessories
    • Hydroponic Supplies
    • Plant Covers
    • Seed Starting Supplies
    • Seed Trays
    • Shade Cloth & Fabric
  • Herbicide Insecticide & Fungicide
    • Arbor care
    • Fungicides
    • Herbicide Surfactants
    • Insecticides
    • Lawn Weed Control
    • Pond Supplies
    • Post-Emergent Herbicides
    • Pre-Emergent Herbicides
  • Nursery Supplies
    • Ground Cover
    • Nursery Pots
    • Plant Supports
    • Soilless Mix
    • Weed Control
Recently Viewed
  • Coco Weed Guards, 29-Centimeter Diameter, Case Of 240 Coco Weed Guards, 29-Centimeter Diameter, Case Of 240 $123.97 Original price was: $123.97.$86.78Current price is: $86.78.
  • Description
  • Reviews (0)

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.

Product Specs
  • 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 Warranty Information

Osmocote 19-5-8 Slow Release Fertilizer -Outdoor Garden Store Down to Earth Guarantee web 2

  • This product is covered under A.M. Leonard’s exclusive 30-Day Down to Earth Guarantee. Click Here for more Details.
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
Frequently Asked Questions
What are the nutrient contents of Osmocote 19 5 8 Slow Release Fertilizer Fortified with STEP Hi Mag Nutrients?
Osmocote 19 5 8 Slow Release Fertilizer Fortified with STEP Hi Mag Nutrients contains nitrogen (19%), phosphorus (5%), potassium (8%), magnesium (1.5%), sulfur (8.1%), calcium (1.6%), iron (1.0%), copper (0.06%), and zinc (0.13%).

How long does the slow release feature of Osmocote 19 5 8 last?
The slow release feature of Osmocote 19 5 8 lasts for 8 to 9 months.

What type of outdoor gardening is Osmocote 19 5 8 ideal for?
Osmocote 19 5 8 Slow Release Fertilizer Fortified with STEP Hi Mag Nutrients is great for general purpose outdoor production.

What are the benefits of using Osmocote 19 5 8 Slow Release Fertilizer Fortified with STEP Hi Mag Nutrients?
The benefits of using Osmocote 19 5 8 Slow Release Fertilizer Fortified with STEP Hi Mag Nutrients include: (1) consistent release over 8 to 9 months, (2) dual coated design that reduces nitrogen leeching and decomposes with minimal environmental impact, (3) highly efficient nutrient delivery that results in robust growth and maximize yields, and (4) affordability.

Additional Product Information
  • SDS
  • Label

Reviews

There are no reviews yet.

Be the first to review “Osmocote 19-5-8 Slow Release Fertilizer” Cancel reply

Related products

Sale!
Hydretain Granular OC, 15 Pounds
Quick View

Fertilizers & Treatments

Hydretain Granular OC, 15 Pounds

$37.09 Original price was: $37.09.$25.96Current price is: $25.96.
Sale!
Peters Excel CalMag Fertilizer, 15-5-15
Quick View

Fertilizers & Treatments

Peters Excel CalMag Fertilizer, 15-5-15

$58.15 Original price was: $58.15.$40.71Current price is: $40.71.
Sale!
Fertil Five Adjustable Granular Applicator With 5 Liter Tank Capacity
Quick View

Fertilizers & Treatments

Fertil Five Adjustable Granular Applicator With 5 Liter Tank Capacity

$368.90 Original price was: $368.90.$98.99Current price is: $98.99.
Sale!
Leonard Fertilizer Tablets For Fruit And Nut Trees 28-8-4 Controlled Release 24 Months 19
Quick View

Fertilizers & Treatments

Leonard Fertilizer Tablets For Fruit And Nut Trees 28-8-4 Controlled Release 24 Months 19

$104.85 Original price was: $104.85.$73.40Current price is: $73.40.
Sale!
Fairlawn Shade Mix, 5 Lb Bag
Quick View

Fertilizers & Treatments

Fairlawn Shade Mix, 5 Lb Bag

$42.10 Original price was: $42.10.$29.47Current price is: $29.47.
Sale!
Wilt-Pruf Anti-Transpirant Plant Protection 1 Gallon Concentrate
Quick View

Anti-Transpirant

Wilt-Pruf Anti-Transpirant Plant Protection 1 Gallon Concentrate

$100.55 Original price was: $100.55.$70.39Current price is: $70.39.
Sale!
P.V.P Industries Perlite, Super Coarse
Quick View

Fertilizers & Treatments

P.V.P Industries Perlite, Super Coarse

$32.10 Original price was: $32.10.$22.47Current price is: $22.47.
Sale!
BioPlex Transplant Concentrate & Plant Enhancer
Quick View

Fertilizers & Treatments

BioPlex Transplant Concentrate & Plant Enhancer

$166.90 Original price was: $166.90.$95.99Current price is: $95.99.
MY ACCOUNT
  • Cart
  • Checkout
  • My account
  • Wishlist
ABOUT US
  • About Us
  • FAQ
  • Returns & Exchanges
  • Delivery
  • Contact Us
LEGAL
  • Privacy Policy
  • Payment Method
  • Shipping & Returns
  • Term and Conditions
Signup for Newsletter

Sign up for exclusive offers, original stories, events and more.

    Copyright 2026 © www.ecogardenoutdoor.com
    • Nursery Supplies
      • Nursery Pots
      • Plant Supports
      • Weed Control
      • Ground Cover
      • Soilless Mix
    • Herbicide Insecticide & Fungicide
      • Insecticides
      • Post-Emergent Herbicides
      • Fungicides
      • Arbor care
      • Herbicide Surfactants
      • Pre-Emergent Herbicides
      • Pond Supplies
      • Lawn Weed Control
    • Greenhouse Supplies
      • Greenhouse Accessories
      • Greenhouse Plastic & Poly Film
      • Seed Trays
      • Hydroponic Supplies
      • Seed Starting Supplies
      • Shade Cloth & Fabric
      • Grow Lights & Accessories
      • Plant Covers
    • Field Production
      • Tying & Securing
      • Burlap
      • Field Staking
      • Baskets
      • Tree Guards & Wraps
      • Grafting Tools & Supplies
      • Orchard & Harvesting
      • Tree Shelters
    • Fertilizers & Treatments
      • Soil Amendments
      • Slow Release Fertilizer
      • Lawn & Grass Fertilizer
      • Organic Fertilizer
      • Water Soluble Fertilizer
      • Plant and Flower Fertilizer
      • Rooting Hormone
      • Anti-Transpirant
    • Login

    Login

    Lost your password?

    Register

    Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy.