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Aerating a lawn before seeding it or adding new grass seed is a smart decision. By loosening up compact soil and allowing it to take in more air and water, your seeds will have an easier time establishing roots and growing. Aerating beforehand also means your seeds will have better contact with the soil, so more of your seeds have a chance to germinate. If you do plan to aerate your lawn before seeding, aerate about two days before you plan to start seeding.

While hydroseeding is designed for bare soil, it is possible to apply it over an existing lawn with certain adjustments. For the new seed to be successful, it needs good seed-to-soil contact to germinate and take root. Without proper preparation, most of the new seed will fail to establish and will die. To hydroseed over existing grass, first mow the lawn as low as possible, then loosen and clear any exposed soil. It is also recommended to use a finer mulch mixture in the hydroseed spray, which helps the seeds penetrate the existing turf and reach the soil without suffocating the established grass.

Bahia grass is not difficult to grow, but you might need patience for this slow-growing grass. Whereas some grass species, like Bermuda grass, can take 1 to 2 weeks to germinate, Bahia grass can take two or three times as long, making it seem like it won’t grow. But again, once your Bahia grass is established, it requires little maintenance. Its deep root system makes it a very durable grass that can bounce back after freezes and droughts. 

The time you should wait before walking on new grass depends on whether you used seed or sod. If you laid new grass seed, it's best to wait about eight weeks before stepping on it, as new grass is fragile. For sod, it typically establishes itself in the ground in about two weeks. For heavy traffic, like driving a car across a new grass driveway, you might need to wait an entire season.