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Adding seed to existing grass is often known as overseeding, as opposed to reseeding. Reseeding refers to the process of filling in bare or dying patches of lawn—or in some cases, full lawns—whereas reseeding supports existing lawns to prevent thinning. Overseeding is an ideal annual lawn care practice for grass fighting drought, disease, weeds, or pest issues.

The easiest way to rough up soil to accept grass seed and provide the best opportunity for its growth is to make several passes over the area with a garden tiller and rake away the loosened vegetation and debris. However, in some cases, very hard ground may require using a shovel or pick to break up pieces into smaller chunks that the tiller can handle more easily.

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.

The screwdriver test involves trying to push a screwdriver into your lawn. If it goes in easily, you’re likely overwatering and should cut back. If there’s moderate resistance, you have a good watering schedule and soil composition. If there’s a lot of resistance or you can’t get the screwdriver into the soil, you may need to aerate your lawn to reduce compaction and increase your watering schedule.