GreenThumb
Green Thumb 32-0-10 Granular Winterizer Lawn Fertilizer, 15M
Best winterizer for homeowners seeking stronger roots and early spring greening.
Prepare your lawn for the changing seasons with Green Thumb Winterizer Lawn Fertilizer. This 32-0-10 granular formula is specifically designed to help your lawn withstand winter stress, promoting a stronger root system for a thicker, greener appearance in fall and a faster green-up in spring. Enriched with 2% iron for enhanced deep greening and featuring 50% controlled-release nitrogen, it provides continuous feeding for up to 16 weeks. This easy-to-apply fertilizer covers 15,000 square feet, ensuring your lawn receives essential nutrients throughout the dormant period.
$51.99
Owner Satisfaction
4.5
/ 5
Category Rank
3039
/ 4348
#3039 in Fertilizers
Price vs Category Average
-16%
Below average
NPK Ratio
32010
/ --
Who it's for
- Homeowners wanting a vibrant, early green-up after winter
- Gardeners living in regions with harsh, freezing winters
- Eco-conscious residents living near protected local waterways
Who should skip it
- Gardeners seeking a versatile, year-round lawn treatment
- Homeowners establishing new grass seed or fresh sod
- Beginners uncomfortable with precise spreader calibration
Performance breakdown
Nutrient Longevity
Sixteen weeks of feeding provides reliable support through the entire dormant season.
Coverage Efficiency
Fifteen thousand square feet of coverage handles most residential lawns with ease.
Greening Potential
Added iron content ensures a deep, vibrant color during the transition months.
Root Development
High nitrogen formula builds a robust foundation for early spring growth.
Application Ease
Granular consistency allows for simple, even distribution with standard broadcast spreaders.
Release Precision
Half controlled-release nitrogen balances immediate impact with sustained, long-term nourishment.
Key Specs
NPK Ratio
32-0-10
Coverage Area
Up to 15,000 square feet
Nitrogen Release
50% Controlled Release
Micronutrient Content
2% Iron
Feeding Duration
Up to 16 Weeks
Fertilizer Source
Mineral Based
Season of Application
Winter
Target Plant Type
Lawn
Features
- Survives winter stress
- Develops stronger roots
- Promotes fall and spring greening
- Contains iron for deep green color
- Provides up to 16 weeks of feeding
- Covers 15,000 sq. ft.
- Slow and continuous nitrogen release
What customers say
The Green Thumb Winterizer earns high marks primarily for its effectiveness and straightforward application. Consumers frequently highlight the noticeable quality of the results, noting a deep, resilient green that persists well into the colder months. The product’s granular design ensures excellent ease of use, spreading consistently and reliably without the common issue of clumping. This makes winterizing the lawn a simple, efficient task, confirming its reputation as a dependable choice for proactive lawn care.
Know before you buy
This fertilizer is formulated to help your lawn survive winter stress by strengthening the root system. This preparation leads to a thicker lawn in the fall and a faster, more vibrant green-up when spring arrives.
The formula features 50% controlled-release nitrogen, which provides a steady, continuous supply of nutrients to your grass for up to 16 weeks.
Yes, the inclusion of 2% iron in the formula is specifically designed to promote a deeper, richer green color in your grass.
No, this is a mineral-based, non-organic fertilizer. It is designed for effective, controlled nutrient release to support lawn health throughout the winter months.
A single bag of this granular fertilizer is designed to cover up to 15,000 square feet, making it suitable for larger residential lawns.
While the product is not water-soluble, it is standard practice to lightly water your lawn after applying granular fertilizer to help the nutrients reach the soil surface and begin the feeding process.
Still have a question?
Ask Hayley anything about this product before you decide.