Lawn Lime Applying lime to an acidic lawn can help raise the Ph of the soil to be more favorable for grass growth. Doing this as part of your annual lawn care will help keep your lawn healthy while keeping moss and weeds in check. What is lime? Lime is pulverized limestone. The primary active ingredient is calcium carbonate (CaCO3). Most liming agents will be at least 95% calcium carbonate Why lime? You should apply lime to a yard that has a low pH (acidic soil). Grass will s