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Bermuda grass is one of the fastest-growing warm-season grasses because of its system of aboveground stems (stolons) and below-ground stems (rhizomes). Adequate water and sunlight in a warmer climate will nurture the spread of Bermuda grass. This rapid growth rate makes Bermuda grass resilient and effective at choking weeds. However, this aggressive advancement can also make the grass difficult to contain and control.

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.

There are plenty of products to help green up your grass. Try an iron supplement spray or fertilizer that is rich in nitrogen. You can also apply a thin layer of compost on top of your lawn at the beginning of spring to give the grass a nutrition boost, which helps it achieve that bright color you are looking for. 

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.