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Don't pick up or dispose of aeration plugs. They will break down by themselves in one or two weeks. Rainfall will speed this up, as will watering the lawn. Mowing helps, but don't mow the grass too soon post-aeration. It's unusual that the plugs would remain after three or four weeks, but mowing and raking will break them down by that point.

There are a few time periods or conditions during which you should avoid aerating your lawn. For example, do not aerate when the ground is frozen or waterlogged, as it can damage the soil structure and grass roots. Aerating during the peak of summer heat or drought is also not recommended since it can stress your grass further. It's best to wait for cooler, more favorable conditions. Finally, newly seeded lawns should not be aerated until the grass is well-established, usually at least one year after seeding.

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.

Many factors can cause your yard to have lawn depressions. Here are the most common reasons: 

• Heavy rainfall 

• Wild animals such as moles, voles, and groundhogs that burrow and tunnel

• Poor drainage

• Buried items such as pipes that break down

• Decaying tree roots or stumps

• Soil that has compacted

• Improper mowing techniques

• Driving heavy equipment and vehicles through the yard