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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.

One of the most effective ways to improve lawn absorption is to learn how to aerate your lawn. This is a process where you poke tiny holes all throughout it to break up tough soil and sediment, creating pathways for sunlight, water, air, and nutrients to seep into the plant’s roots. In turn, it promotes stronger root systems, making your lawn or plants less susceptible to pests and disease. Ideally, you’ll want to aerate your lawn at least once per year during the growing season—think late summer to early fall. 

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.

Both zoysia grass and bermuda grass are somewhat similar to St. Augustine because they’re all warm-season grasses. Beyond that, most grass types have unique properties that set them apart. Zoysia grass costs twice the price of St. Augustine grass on average and it has thinner blades and a deeper green appearance. Bermuda grass, compared to St. Augustine, has much thinner blades, is softer to the touch, and has a higher tolerance for colder weather.