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Slit seeding takes about two to three hours for a medium or large lawn. Even bigger lawns or commercial properties can be seeded in about one day. From there, it will take about two weeks for the grass to start growing and another six weeks for the grass to establish stronger roots.

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.

While hydroseeding is typically meant for bare soil, it is possible to hydroseed over an existing lawn with some adjustments. For the new seed to germinate and thrive, it needs good seed-to-soil contact. Without it, most of the seed may not take root and will die. To improve your chances of success when repairing a patchy area, mow any existing grass as low as possible and loosen any exposed soil before application. It is also recommended to use a finer mulch mixture when spraying, as this will help the seeds reach the soil and root without suffocating the existing grass.

Seeding a lawn offers several advantages over laying sod, primarily related to cost and variety. Seeding is less expensive upfront, making it a more budget-friendly option. It also provides a much broader selection of grass varieties, allowing you to choose the best type for your specific climate and soil. Additionally, seeding allows grass roots to establish directly in the native soil, and the installation process is typically less labor-intensive than sodding. However, it's important to consider that sod offers better immediate protection against weeds and erosion.