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Morning and late afternoon are the best times for watering new grass seed. The seed gets a healthy balance of water and sunlight, and the excess water evaporates. If you water the grass long after the sun goes down, the air is too cold, and there's no sun to make excess water evaporate. This keeps the grass damp for too long, increasing the chances of over-watering.

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. 

Yes, after the lawn is overseeded post-aeration, most of the seed germinates in the aeration holes. This leaves the soil undisturbed while lush and healthy grass will grow in the holes' place. The point of this is to create extra turf density in areas that really need it, such as a large patch of dead grass where a shed used to be.

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.