MAG-I-CAL® PLUS Soil Food for Lawns in Alkaline & Hard Soil

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MAG-I-CAL® PLUS Soil Food for Lawns in Alkaline & Hard Soil is the product that, with continued use, can LOWER the pH in your soil.

  • One 18 lb Bag covers 5,000 sq ft
  • Analysis is 18% calcium, 17% sulfur
  • Fortified with calcium sulfate dihydrate, humic acid, fast-acting gypsum, and humates
  • Great for LOWERING the pH in your soil

Product Description:
Jonathan Green Mag-I-Cal Plus for Lawns in Alkaline & Hard Soil contains sulfur and calcium sulfate dihydrate which lowers soil pH, is important to cell development, and is vital to many grass plant functions. Poor soil that is hard and compacted is often the problem when it comes to growing a great lawn.

When soil is too alkaline and compacted, air, water and nutrients cannot get down to the roots, and the grass will not grow properly. Lawns thrive in slightly acidic to neutral soil with pH levels between 6.2 and 7.0. In soils with pH readings of 7.0 to 9.5, weeds thrive 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.

Please Note: This is the product we carry that will help to lower your pH. We have a similar product from Jonathan Green that will raise pH. 

Application Information:
MAG-I-CAL PLUS Soil Food for Lawns in Alkaline & Hard Soil is best applied during the growing season when the soil is not frozen. Spread the product on a dry lawn soon after mowing and for best results, rake the lawn vigorously prior to application. Irrigate the treated area after application for 15-30 minutes. Once watered, wait a day to mow the lawn to give the product time to activate.

This product is safe to apply when you are seeding or sodding and may be used on the following grasses: 

Cool Season Lawns - Kentucky Bluegrass, Turf Type Tall Fescue (all fescues), Ryegrass.
Warm Season Lawns - Bermuda, St Augustine, Zoysia, Centipede, Bahia.


An 18 lb bag will cover 5,000 sq ft

Application  Details

Apply at 3.6 lbs per 1,000 square feet of lawn area

For soils with a pH higher than 7 repeat applications twice a year

Water-In  Instructions

Apply to a dry lawn. For best results, water into the turf for 15-30 minutes

Sweep excess off sidewalks and driveways to avoid staining

Product Resources:

  • Label: Magical Plus Alkaline label
  • Spreader Settings:  See product package label
  • Package Includes: One 18 lb bag
  • Storage: Store in dry conditions away from moisture. Can be stored for up to 2 years.
Shipping Information:

Shipping Costs

Price does NOT include shipping, will be calculated at check out 

NO P.O. Boxes 

State Restrictions

Alaska (AK), and Hawaii (HI)


Yes, free stickers with this item

Typical Delivery Time

4 - 7 business days

Product Type


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All sales are final, no cancellations, returns, or exchanges