Browse by Category
Mag-I-Cal® Plus for Lawns in Alkaline & Hard Soil
- Natural soil food for lawns with alkaline soil
- Loosens hard soils
- Promotes air and water penetration for deeper rooting
- Helps to rapidly lower soil pH to increase grass nutrient absorption
- Spreader Settings
- Product Label
- Reviews (6)
Jonathan Green’s 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.
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 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 a pH higher than 7, repeat applications twice a year.
- 18 lb Bag – 5,000 sq. ft.
- 54 lb Bag – 15,000 sq. ft.
Fortified with: Calcium sulfate dihydrate, humic acid, fast-acting gypsum, and humates
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
The spreader settings listed are approximate. Spreader condition, rate of walk, and humidity are just some of the variables that can affect the rate of application. Please refer to the product label link on this page, or the back of the bag, for further details along with application rates and precautionary statements. You may need to adjust settings for proper coverage if circumstances described on the label are applicable. In all cases, the user should read and follow label instructions before applying any product, and assumes all responsibility when using this spreader settings tool.
Click the button below to view and download a pdf of the product label.
We bought this place 25 years ago – without a Lawn. Immediately I began testing, aerating, coring, fertilizing, reseeding. To No Good Effect! Wasted Money! Heard about Jonathan Greene fertilizers in my Winter research. Ordered and put it down. Not the Immediate Effect other companies claim they have which was fine for me. I grew up on a ranch/farm learning from my Dad that Patience and Determination are required. Put MAG-I-CAL down the next year. People walking past and people driving, when I was outdoors, stopped, and wanted to know What I fertilized with. I told them Jonathan Greene products. Figuring they forgot the name once home, I had some cards made up and gave those out. And that started the “Resident” (my address) mail! Thanking me… Perhaps this long review will help you decide to make the switch to Jonathan Greene products. Happy Gardening! 🙂
Two years ago I had a lawn company come out and service my lawn. It wasn’t bad but I had several spots that were nothing but weed where the grass just would not fill in. To make a long story short they ruined my lawn! The PH was a little low so lime was applied and six months later my lawn became overtaken by weeds. This past spring we overseeded with Bermuda and the results were poor. The grass germinated but again the weeds took over. In September I overseeded with Fescue and even though the grass started coming in it was still thin with lots of bare spots. Finally I purchased a quality PH/Moisture meter and took readings at various places around the yard. The PH was between 6.9 to 7.2 everywhere which explains the slow growth. Bottom line, the lawn company put down too much lime. A few weeks ago I purchased three bags of Mag-I-Cal for Alkaline soil and applied it following the instructions on the bag then watered the lawn. Since that time we have had two good soaking rains. Today I walked outside and I honestly can not believe my eyes. In just two weeks my lawn went from OK to looking as if I had replaced the entire lawn with sod! Mag-I-Cal is the only thing I have used since seeding. I would not believe it had I not seen it with my own eyes! Amazing!
My soil test came back with high pH. This was recommended to me by True Value and I applied it in May. Now in July, the lawn looks better.
My lawn was struggling. There were a few areas that never greened up and weeds were persistent. Fertilizing didn’t help. I took a few soil samples and took them to the USDA lab by the house. Found out the lawn was alkaline at roughly 7.5 ph. I started applying elemental sulphur last year but did not see any difference. This year I decided to try something different. I purchased an electric dethatcher/scarifier and went to town on my yard. It looked bad when I was done. I also aerated with a core machine. When that was done, I applied mag-i-cal plus, love your soil, black beauty ultra seed as well as starter fertilizer. In the 6 weeks since I did this work, my yard has never looked better. I have the greenest yard on the block. The thin spots have filled in nicely and I will make these Jonathan Green products part of my yearly application. I am very happy with these products.
Hopeful for this product but it did not work. My pH is maybe 0.1 – 0.2 lower but certainly not the results I was expecting for the price. I had to buy three bags for my acre of land, what a waste of money!
Very pleased with this product. My lawn was in very poor condition, covered in several different weeds and bare spots. Prior to applying the soil food, I prepared the lawn; pulled all the weeds and raked my lawn, in the front and backyard. I mowed the lawn and did not water it for 5 days to make sure the soil was dry as recommended, then applied the soil food manually (didn’t have a spreader at the time), by mid June. I didn’t do anything else except for deep watering my lawn twice a week the whole summer. I had thought about over-seeding at times in summer, but then wanted to wait until fall, and now I see that I don’t need to plant grass seeds. About a few months later, now in fall, a thick healthy grass has been taking over all the weeds and bare areas. I’ll apply the soil food once a year in spring from now on.
Frequently Bought Together
4.812734082397 out of 5
Black Beauty® Dense Shade Grass SeedShade tolerant Black Beauty varieties that grow well under trees in up to 70% shade.
4.7333333333333 out of 5
Black Beauty® Sunny Grass SeedDrought tolerant & naturally insect resistant Black Beauty variety for full sun areas.
4.5789473684211 out of 5
Green-Up Fertilizer for Seeding & SoddingLawn Food for use on newly planted seed & sod producing healthy, deep roots.