MAG-I-CAL® PLUS Soil Food for Lawns - Lower Soil pH

  • $59.99
  • $54.99

This product will help to lower your soil pH. We have a similar product from Jonathan Green that will raise pH. Be sure you get the right one - this product, purple bag, LOWERS the pH of your soil with continued use.

  • Lowers soil pH to improve nutrient availability
  • Easy to apply using your broadcast spreader
  • Can be used in spring, summer or fall
  • 18 lb bag covers up to 5,000 square feet

We cannot do exchanges if you get the wrong one so be sure you know that this listing here, PURPLE bag, lowers the pH of lawn soils. Please look at the photos in this listing to be sure.

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 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. 

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 section in the accordion below.
  • 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 an 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 best results.
  • Once watered, wait a day to mow the lawn to give the product time to activate.
  • For soils with a pH higher than 7, repeat applications twice a year.

Mag-i-cal can be used on all grass types, such as the following:

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

Label: Mag-i-cal for Alkaline Soil Label

Package Includes: 1 - 18 lb. bag

Coverage: 18 lb Bag - 5,000 sq. ft. 

Water-in Instructions: Apply to a dry lawn and water into turf within 48 hours with 1/4" of irrigation or rainfall.

Sweep excess off sidewalks and driveways to avoid staining.

Application Rate: Apply at 3.6 lbs per 1000 square feet.

Storage: Store in dry conditions away from moisture. Can be stored for up to 2 years.

Does Mag-i-cal need to be watered in?

  • Yes. Apply 1/4" of water from irrigation or rainfall to move the product into the soil.

Can I apply Essential-G on the same day as Mag-i-cal?

  • Yes. We recommend that Essential-G be applied before Mag-i-cal.

Can I apply liquids and Mag-i-cal on the same day?

  • Yes. We recommend applying granular products before liquids. So you would apply Mag-i-cal and other granulars, followed by your liquid products. 


Shipping: United States Only.

Currently NOT shipping to:(AK,HI).

We can not ship to PO Boxes

Typically delivered in 3 - 7 business days.

Cancellations | Returns | Exchanges: All sales are final, no cancellations, returns, or exchanges