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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.

Each type of grass has its own specific needs regarding the timing of aeration, but in general, late summer to early fall is the best time to do so. For most lawns, that means sometime between September and November, though certain types of grass, like St. Augustine Grass, do better with aerations in late spring and early summer.

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 frequency of lawn aeration depends on factors such as soil type, yard traffic, and lawn health. In most cases, annual aeration is sufficient to maintain a healthy lawn. However, if your lawn experiences heavy use or soil compaction issues, you may consider aerating twice a year. Keep an eye on your grass and soil conditions to determine when aeration is needed to keep your lawn in its best shape.