Pennington Fast Acting Lime, 30lb Starts working immediately Raises soil pH quicker than regular lime Encourages a healthier, thicker, greener lawn Easy to Apply with any spreader Can be applied in the spring, summer, and fall Conduct a soil test to determine your soil&#039;s pH. Based on your soil&#039;s pH, use the application guidelines to the left to determine the amount of Pennington Fast Acting Lime Plus AST to apply to your lawn. Use the chart to the right to determine when to apply lime for various lawn and plant types. Pennington Fast Acting Lime Plus AST granules go to work the instant they are exposed to water and do <span class="a-text-bold"><u>not</u> </span>require tilling. Advanced Soil Technology (AST) helps hold calcium from lime in place.