The answer to 'aeration not growing' is that there are several common causes that can prevent successful lawn aeration. The most likely reasons are soil compaction, improper timing, or incorrect aeration method.
Soil compaction is one of the primary reasons aeration may not be effective. Heavy foot traffic, equipment use, or poor drainage can all lead to compacted soil that prevents air and water from reaching the roots. If the soil is too dense, the aeration holes will not open up and allow for proper air and water flow.
Timing is also critical for aeration. The best time to aerate is typically in the fall when grass is actively growing. Aerating in the heat of summer or when the lawn is dormant may not yield the desired results. Additionally, the depth and spacing of the aeration holes is important - if they are too shallow or too far apart, the benefits will be limited.
In some cases, the aeration method itself may be the issue. Core aeration, where soil plugs are removed, is generally more effective than spike aeration which simply pokes holes in the soil. Homeowners may need to consider hiring a professional landscaper who has the right equipment and expertise to properly aerate their lawn.