Jonathan Green Mag-I-Cal® for Lawns in Acidic Soil

Jonathan Green

  • $34.99
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  • One bag of Mag-I-Cal® has the pH adjusting power of up to 15 bags of limestone!
  • Rapidly raises and balances low soil pH
  • Stimulates microbial life to create a healthy environment for grass
  • Increases grass roots ability to absorb nutrients

Product Overview

Adjust your soil with Mag-I-Cal®! Jonathan Green Mag-I-Cal® for Lawns in Acidic Soil helps rapidly raise soil pH that's too low and stimulates healthy microbes in the soil. Healthy, lush lawns thrive in soils with slightly acidic to neutral pH levels ranging from 6.2 to 7.0. When soil pH levels drop between 4.0 to 6.0, this creates an environment for weeds to thrive and grows a lawn full of light green unsightly grass.

Mag-I-Cal® for Lawns in Acidic Soil contains pelletized calcium carbonate, or lime, in a completely soluble form that is immediately available to rapidly and efficiently raise soil pH upwards. Poor soil is often the problem in growing a great lawn and calcium is vital to many grass plant functions. Where it may take several bags of lime to balance low soil pH, Mag-I-Cal® for Lawns in Acidic has the power to do it all in just one easy application!

Additionally, Mag-I-Cal® for Lawns in Acidic contains humates to stimulate beneficial microbes in the soil.

Coverage Guide

For soils with a pH over 5.9, use the new lawns rate.


Established Lawns
New Lawns
18 lb Up to 5,000 sq. ft. Up to 2,500 sq. ft.
54 lb Up to 15,000 sq. ft. Up to 7,500 sq. ft.

This product can be applied throughout the United States and performs well on both cool and warm-season lawns.

For cool and warm season lawns, apply in either spring, summer or fall when air temperatures are at least 45°F.

Calcium (Derived from: Calcium Carbonate)

Also contains non-plant food ingredients: humic acid (derived from humus), polyhydroxycarboxylic acids (derived from plant extracts).

Mag-I-Cal® for Lawns in Acidic Soil contains natural ingredients and can be applied with any of our grass seeds, weed controls, fertilizers, and insect and lawn disease controls.

  • For a pH of 5.9 to 6.7:

Apply Mag-I-Cal® Plus for Lawns in Acidic & Hard Soil once per year.

  • For a pH of 5.9 or below:

Apply Mag-I-Cal® Plus for Lawns in Acidic & Hard Soil twice per year (at least one month apart).

Mag-I-Cal® for Lawns in Acidic Soil is a natural product, meaning it is safe for children and pets to re-enter the lawn immediately after application.

  • Carefully read all instructions prior to application.
  • Store in a cool, dry place away from children and pets.
  • Do not ingest. May cause irritation to eyes and skin.
  • Wash hands thoroughly with soap and water after handling and before eating or drinking.
  • Do not apply near water, storm drains, or drainage ditches.
  • Do not apply if heavy rain is expected.
  • Apply this product only to your lawn or garden and sweep any product that lands on the driveway, sidewalk or street back onto your lawn or garden.

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