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Hydroseeding over an existing lawn is possible, but certain adjustments are necessary since the process is for bare soil. Hydroseed mix is ​​usually very thick, which helps protect the seeds during germination. If you have existing grass on your site and still want to hydroseed, it's better to use a finer mulch mixture when spraying. A finer mulch mix means the seeds can root into existing soil without suffocating the existing grass.

The frequency of lawn aeration depends on various factors such as soil type, grass variety, and lawn usage. In most cases, aerating once a year, typically in the fall or early spring, is sufficient to maintain a healthy lawn. However, lawns subject to heavy foot traffic or especially compacted soil may benefit from more frequent aeration, possibly every six months. It's essential to assess your lawn's specific needs and consult with a lawn care professional if you're unsure about the ideal aeration schedule for your property.

You can try that, but it isn't likely to yield results. It's like watering potted plants without putting the seeds in. Most of the tossed grass seeds sit on top of the soil or existing grass blades and never germinate. The seeds need to make it into the soil, just like growing a potted plant. The best way to accomplish this is to aerate your lawn first, then overseed.

Technically, yes—and you may have some successful growth—but this isn’t the ideal way to fill in sparse areas. By clearing leaves and debris, amending the soil, and aerating it properly before you lay the seeds, you’re providing the most ideal conditions for them to germinate.