Cool Season Lawns: Winterizer Value Pack | Yard Mastery

Cool-Season Winterizer Pack | Flagship, Humic12 & Air-8 Lawn Fertilizer Kit

Put your cool-season lawn to bed the right way with the Yard Mastery Cool-Season Winterizer Pack. This late-fall pack combines 24-0-6 Flagship granular fertilizer with Humic12 liquid humic acid and Air-8 liquid aeration. It prepares Kentucky bluegrass, perennial ryegrass, and turf-type tall fescue to green up early and grow strong next spring.

A winterizer is simply the last fertilizer application of the year. It goes down after your lawn stops growing but before the ground freezes. The nitrogen isn’t used right away. It’s stored in the soil and becomes available as the snow melts, giving your lawn an early, fast green-up coming out of winter. Buying the products together as a pack saves 25% versus buying them separately.

When to apply: Use the Winterizer Pack if you’re still mowing your lawn at least every 10–12 days. If your lawn has already gone dormant and you’ve stopped mowing, it’s too late to use this pack this season.

Flagship Label & Specs
Humic12 Label & Specs
Air8 Label & Specs

Key Benefits

• Final fertilizer application of the year for cool-season lawns
  
• Helps lawns green up earlier and faster in spring
  
• Includes 24-0-6 Flagship granular fertilizer with nitrogen and potassium
  
• Air-8 opens up compacted soil so air and water can move deeper
  
• Humic12 adds carbon to the soil and supports root growth
  
• Improves soil structure, nutrient uptake, and water retention
  
• Air-8 and Humic12 can be mixed together in one hose-end sprayer
  
• Includes a hose-end sprayer and empty quart bottle
  
• Saves 25% compared to buying the products separately
  
• Covers up to 6,000 sq ft

How the Winterizer Pack Works

The Cool-Season Winterizer Pack is applied in two steps a few weeks apart.

• Step 1: Air-8 and Humic12 (while the lawn is still growing). Air-8 penetrates the soil and opens space for air and water to move into the root zone. Humic12 then adds carbon to that space, improving soil structure and supporting healthy roots heading into winter.
  
• Step 2: Flagship (the final application, just before the ground freezes). Once the lawn has stopped growing, a final application of 24-0-6 Flagship puts nitrogen in place for next season. As the snow melts in spring, that nitrogen moves into the soil and feeds the lawn early, so it greens up faster.
  

Approved Turf Types

The products in this pack are safe for all grass types. As a winterizer program, it’s designed for cool-season lawns, including:

• Kentucky bluegrass
  
• Perennial ryegrass
  
• Turf-type tall fescue (all fescues)
  

Coverage and Package Contents

• Coverage: One pack covers up to 6,000 sq ft 
• Flagship: One 18 lb bag
  
• Humic12: One quart 
  
• Air-8: One quart 
  
• Application equipment: One hose-end sprayer
•  Exclusive Flagship magnet 

Application Information

Step 1: Air-8 and Humic12

• Apply as soon as your pack arrives, while your lawn is still actively growing.
  
• Add 6 oz of Air-8 and 6 oz of Humic12 per 1,000 sq ft to the empty quart bottle, then fill the rest of the bottle with water.
  
• Attach the included hose-end sprayer top and spray evenly across the lawn.
  
• Water into the soil within 24 hours with about ¼ inch of rainfall or irrigation.
  
• Keep mowing as needed while growth slows over the next several weeks.
  

Step 2: 24-0-6 Flagship (final application)

• Apply once your lawn has completely stopped growing and you expect your final mow of the season.
  
• Spread 3 lb per 1,000 sq ft, ideally just before the first significant snow or hard freeze.
  
• Do not apply if the ground is already frozen.
  
• Blow, sweep, or rinse any granules off sidewalks and driveways to help prevent staining.