Jonathan Green Mag-I-Cal Plus Lawn Conditioner

This product is designed specifically for lawns with alkaline soil (high pH) or compacted, hard soil. If your grass is struggling despite regular watering and fertilizing, a simple soil test can confirm if your pH levels are too high, which prevents your grass from absorbing nutrients.

Yes, you can apply Mag-I-Cal Plus alongside most fertilizers. Because it is a granular, slow-release formula, it works gradually to improve soil chemistry without interfering with the immediate nutrient delivery of your standard lawn food.

This is formulated for year-round use. You can apply it in the spring, summer, fall, or winter as part of your annual lawn care program to maintain consistent soil health and structure.

While soil chemistry changes are gradual, you will typically notice improvements in soil texture and grass vitality within a few weeks of application. For the best results, consistency is key, so follow the recommended annual program to keep your soil in the optimal range.

As with any lawn treatment, it is best practice to keep pets and children off the lawn until the granules have been watered in and the grass has dried completely. Always check the product label for specific safety instructions regarding your local environment.