16-0-0 Double Dark Granular Lawn Fertilizer

Product Specifications

• NPK Analysis: 16-0-0
• Nitrogen Content: 16% total nitrogen (25% of that is slow-release)
• Iron Content: 6%
• Micronutrients: Iron, Manganese, Sulfur and Zinc
• Bio-Nite™: Yes
• Form: Granular
• Application Rate: 3 lbs per 1,000 sq ft
• Bag Sizes:
  • 18 lb (6,000 sq ft)
  • 45 lb (15,000 sq ft)
• Water-In Requirements: Water in within 48 hours with at least 1/4 inch of irrigation or rainfall
• Concrete Staining: Yes, sweep excess off sidewalks and driveways to prevent staining
• Storage: Store in away from moisture for up to 2 years

Resources & Videos

• Product Label & Specs (PDF)
• Spreader Settings Guide
• Yard Mastery App

Frequently Asked Questions

What Is 16-0-0 Double Dark Fertilizer Used For?
16-0-0 Double Dark Granular Lawn Fertilizer is designed to provide a deeper blue-green color without excessive surge growth. It contains 16% nitrogen, 6% iron, and Bio-Nite™ to support turf color, nutrient uptake, and soil microbial activity. Double Dark can be used during the growing season on established cool-season and warm-season lawns.

How Does 16-0-0 Double Dark Help Make Your Lawn Darker Green?
Double Dark combines nitrogen and iron to enhance turf color. Its 6% iron content supports deep blue-green color, while 16% nitrogen helps the grass actively grow and take in nutrients without pushing excessive growth. The formula also includes slow-release nitrogen for more sustained feeding and Bio-Nite™ to support soil microbes.

How Much 16-0-0 Double Dark Should You Apply per 1,000 Square Feet?
Apply Double Dark at 3 pounds per 1,000 square feet. An 18-pound bag covers up to 6,000 square feet, while a 45-pound bag covers up to 15,000 square feet. Apply to dry turf, sweep excess fertilizer off sidewalks and driveways to help prevent staining, and water it in within 48 hours with at least ¼ inch of rainfall or irrigation.

Can 16-0-0 Double Dark Be Used on All Grass Types?
Yes. Double Dark can be used on established cool-season grasses, including Kentucky bluegrass, turf-type tall fescue, and perennial ryegrass, as well as warm-season grasses such as bermuda, St. Augustine, zoysia, centipede, and bahia. Apply only while the turf is actively growing and always follow the product label.

Is 16-0-0 Double Dark Safe for Pets and Children?
16-0-0 Double Dark can be used around homes with pets and children when applied according to the product label. Keep people and pets off the lawn during application and until the fertilizer has been watered in and the grass has dried. Store the product securely away from children and animals, and sweep any granules from sidewalks, driveways, or other hard surfaces.

Shipping & Support