Yes, applying lime after aeration can be a good practice, Here’s why:

Benefits of applying lime after aeration:

  • Improved penetration: Aeration creates small pockets in the soil, allowing the lime to reach deeper layers where it can be more effective in raising the soil pH.
  • Enhanced efficiency: Since the lime doesn’t have to penetrate as much compacted soil, it can work more efficiently and potentially require a slightly lower application rate.

I use a newer generation of enhanced lime that breaks down and adjusts the soil pH more quickly that is composed of:

  • Calcitic lime: This type of lime is commonly used for raising soil pH because it contains a high concentration of calcium carbonate (CaCO3), which helps neutralize soil acidity.
  • Acidifying agent: That accelerates the breakdown of the lime particles, making the calcium carbonate more readily available to raise soil pH faster compared to traditional, non-acidified calcitic lime.

The relationship between lime and moss is a bit more nuanced than a simple yes or no answer. Here’s a breakdown of how lime affects lawn moss:

  • Indirect effect: Lime does not directly kill moss. Moss thrives in acidic soil, and lime works to raise the soil pH (make it less acidic). As the soil becomes more alkaline, it creates a less favorable environment for moss growth, potentially discouraging its spread.
  • Long-term effect: The impact of lime on existing moss is minimal. While it might make the environment less hospitable, noticeable reduction in moss takes time and involves other lawn care practices.
  • Root cause: It’s important to address the underlying reasons why moss is thriving in your lawn. These often include:
    • Too much shade
    • Poor drainage
    • Compacted soil
    • Low soil fertility

 This decision depends entirely on your specific circumstances. Here’s why:

  • Location and grass type matter:  The ideal time for applying lime can vary based on your location and the type of grass in your lawn. In general, early spring or fall are considered suitable times in the Seattle area, but specific timing needs might differ.
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