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Mag-I-Cal® Plus for Lawns in Acidic & Hard Soil

Jonathan Green

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Product Overview

  • All-in-One solution to raise soil pH, reduce compaction, and feed microbes
  • Natural ingredients transform the soil for optimal plant growth
  • Rapidly raises soil pH and improves nutrient absorption
  • Loosens hard soil for improved aeration and better rooting
  • Suitable for all grass types and gardens!


  • 18 lb Bag – 5,000 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

Jonathan Green 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.