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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.

Although core aeration is overall a better method of aerating a lawn, spike aeration can still be helpful, especially if you have a smaller yard or are only trying to work on a specific problem area. Because spike aeration is so accessible thanks to its lower cost and easy DIY tools like aerator shoes, it can still be worthwhile for some gardeners.

DIY is possible with rental equipment, but professional services ensure even and thorough aeration.

Aerating a newly sodded lawn is generally not recommended immediately after installation. It's crucial to allow the sod to establish itself first, typically over the first growing season. Aerating too soon can disrupt the fragile root systems of the newly laid sod and potentially damage the turf. It's best to aerate prior to laying new sod or wait until the sod has fully rooted and the lawn is stable before considering aeration, usually after the first year.