Mag-I-Cal Plus

Product Description
Mag-I-Cal Plus - Natural Soil Food for lawns in acidic and hard soil.
  • Natural soil food for lawns in acidic soil
  • Helps to rapidly raise soil pH increasing nutrient absorption
  • Loosens hard soil promoting air and water penetration for better rooting   

18 lb Bag – 5,000 sq. ft.  - $34.98

54 lb Bag – 15,000 sq. ft. - $79.98

Jonathan Green’s Mag-I-Cal® Plus for Lawns in Acidic & Hard Soil contains calcium carbonate in a  completely soluble form that is immediately available to adjust soil pH  upwards. Poor soil is often the problem in growing a great lawn and  calcium is vital to many grass plant functions. When soil is compacted  or too acidic, air, water, and nutrients are unable to reach the roots,  making it very difficult for grass to flourish. 

Lawns thrive in soil with slightly  acidic to neutral pH levels ranging from 6.2 to 7.0. When pH levels drop  between 4.0 to 6.0 weeds flourish and the grass becomes light green and  spindly. Additionally, Mag-I-Cal Plus® helps to break up  clay and compacted soils. This improves root penetration and promotes  growth by increasing biological activity and releasing nutrients trapped  in the soil.

In-store quantities & prices may vary on some items.
Maximum quantity available reached.

When to Apply:

Best applied during the growing season when the soil is not frozen.   Safe to apply when seeding or sodding.   Spread the product on a dry lawn soon after mowing.


For best results, rake the lawn vigorously prior to application.  Use a rotary or drop lawn spreader.  To select the proper setting see the SPREADER SETTINGS ONLINE TOOL tab.  Apply around the perimeter of the lawn to establish a turning area.  Then run the spreader back and forth within the area outlined by your first perimeter application.  Always allow overlap to avoid gaps in coverage.


To avoid staining, sweep any excess granules off of hard surfaces and back onto the lawn.  Irrigate the treated area after application for 15-30 minutes for the best results.  Once watered, wait a day to mow the lawn to give the product time to activate.  For soils with pH lower than 6, repeat applications twice a year.


Coverage: 18 lb Bag – 5,000 sq. ft.  54 lb Bag – 15,000 sq. ft.

Fortified with: Highly soluble calcium carbonate, fast-acting gypsum, humates, iron, and amino acids

Can Be Used When Seeding: Yes

Apply to Dry or Damp Lawn: Dry

Safe for Children & Pets: Yes

Application Temperature Range: Minimum 45°F

When to Use: Spring, summer or fall


Click the link to the Jonathan Green Product Page and navigate to the Spreader Settings tab for recommended spreader settings.