Jonathan Green Mag-I-Cal Plus

This product is specifically formulated for lawns with acidic soil—typically a pH below 6.2—or soil that is hard and compacted. If your grass is struggling to thrive despite regular watering and feeding, a soil test is the best way to confirm if your pH levels are the root cause.

Yes, you can apply Mag-I-Cal Plus alongside other fertilizers. It is designed to work as a soil conditioner, helping to unlock nutrients already in the soil so your grass can actually absorb the fertilizer you apply.

While you won't see an overnight transformation, you should notice improvements in soil texture and grass color within a few weeks. Because it works to correct the underlying soil chemistry, the most significant benefits, such as deeper root growth and thicker turf, become more apparent over the course of the growing season.

Once the product has been watered into the soil according to the label instructions, it is generally safe for pets and children to return to the lawn. As with any lawn treatment, it is best practice to keep them off the grass until the granules have fully dissolved.

You do not need to till this product. It is designed to be applied with a standard broadcast or drop spreader directly onto the surface of your lawn. Once applied, watering it in helps the active ingredients penetrate the soil profile.