Jonathan Green - Mag-I-Cal Lawn Fertilizer - 5,000 sq. ft.
Best soil balancer for homeowners looking to revitalize acidic, nutrient-depleted lawns.
Revitalize your lawn with Jonathan Green's Mag-I-Cal Lawn Fertilizer. This granular formula is designed to cover up to 5,000 square feet, effectively raising soil pH and unlocking trapped nutrients for a healthier turf. Its highly soluble calcium ensures rapid action, and it's safe for application on new seed or sod. For soils with a pH below 6, applying twice a year is recommended. This versatile fertilizer can be applied anytime during the growing season, promoting vibrant growth and improved soil conditions.
$19.99
Owner Satisfaction
4.5
/ 5
Category Rank
3091
/ 4425
#3091 in Fertilizers
Price vs Category Average
-68%
Below average
Coverage
5000.
/ Up to , sq ft
Who it's for
- Gardeners needing immediate soil pH correction for healthier grass
- Lawn owners seeking vibrant green color and stronger cell structure
- Beginners worried about accidental lawn burn during application
Who should skip it
- Homeowners looking for an all-in-one nutrient feeding solution
- Budget-conscious shoppers preferring cheaper bulk agricultural lime alternatives
- Gardeners who skip soil testing before applying chemical amendments
Performance breakdown
pH Correction Speed
Highly soluble calcium delivers rapid soil chemistry adjustments for struggling lawns.
Nutrient Bioavailability
Effectively unlocks dormant soil nutrients to maximize existing fertilizer performance.
Application Versatility
Safe for new seed and effective across every growing season.
Ease of Spreading
Granular consistency ensures uniform coverage with standard broadcast spreaders.
Coverage Efficiency
Five thousand square feet of coverage suits most standard residential lots.
Soil Health Impact
Mineral-based formula creates a superior foundation for long-term turf vitality.
Key Specs
Coverage
Up to 5,000 sq. ft
Fertilizer Source
Mineral Based
Season of Application
Spring, Summer, Fall, Winter
Target Plant Type
Lawn
Fertilizer Form
Granular
Release Type
Quick Release
Active Ingredient
Calcium
Features
- Rapidly raises soil pH
- Releases trapped soil nutrients
- Highly soluble calcium for quick action
- Safe for new seed or sod
- Granular form for easy application
- Effective anytime during growing season
What customers say
Customers overwhelmingly praise Jonathan Green's Mag I Cal for its rapid effectiveness in correcting acidic soil, calling it a game changer for lawn health. The primary focus is on its speed; users see noticeable improvements in grass color and density within weeks, far quicker than traditional lime. This success is attributed to its ability to unlock nutrients and boost fertilizer uptake. Application is another major benefit, as the granular formula spreads easily without the mess of powdered lime, offering homeowners convenience. While severely neglected lawns may need multiple applications, the consensus is that the superior speed and results justify the cost. This product successfully addresses foundational soil chemistry, leading to healthier turf and high satisfaction.
Know before you buy
Mag-I-Cal is specifically designed to raise soil pH. You should test your soil first; if your pH is below 6.0, this product will help unlock nutrients that are currently trapped in the soil and unavailable to your grass.
Yes, this formula is safe to use when planting new grass seed or laying sod. It helps create a more hospitable soil environment for new roots to establish.
Because it features highly soluble calcium, Mag-I-Cal works more rapidly than traditional pelletized lime. While soil chemistry changes take time, you can expect to see improved nutrient uptake and turf health throughout the growing season.
Mag-I-Cal is a soil amendment rather than a traditional N-P-K fertilizer. It focuses on balancing soil pH to make your existing fertilizer more effective, so you should continue your regular feeding schedule alongside it.
For soils with a pH below 6.0, we recommend applying it twice per year. Because it is effective throughout the growing season, you can apply it in the spring, summer, or fall depending on your soil test results.
Still have a question?
Ask Hayley anything about this product before you decide.