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Carpetgrass is a low-maintenance grass requiring little fertilization that thrives in subprime growing conditions. However, regular mowing is necessary to avoid the growth of unsightly seed stalks, and you may have to water it frequently to prevent drying out the soil. That includes watering the grass over dry winters to help keep it healthy, and it may start dying out in particularly cold climates where it grows poorly. Carpetgrass can also be vulnerable to some types of turf fungus, so it’s important not to overthatch. 

Hydroseeding over an existing lawn is possible, but certain adjustments are necessary since the process is for bare soil. Hydroseed mix is ​​usually very thick, which helps protect the seeds during germination. If you have existing grass on your site and still want to hydroseed, it's better to use a finer mulch mixture when spraying. A finer mulch mix means the seeds can root into existing soil without suffocating the existing grass.

St. Augustine is a hardy grass that’s relatively easy to grow, but it requires regular lawn maintenance to stay healthy. It’s best to keep up with a regular fertilization schedule during the growing season, plus a yearly dethatching to help it properly absorb air and moisture. Watering is also important, so be sure to water it enough to keep the soil moist.

First, you should figure out whether you have dormant or dead grass. Dead grass won’t come back, so you’ll have to reseed if you’re hoping for a lush lawn. However, grass can go dormant if it hasn’t received enough water or if temperatures are too cold. If it’s still decently warm outside, you can revive dormant grass by watering it. But if it’s mid-January in New England, for example, you’ll need to wait until the weather warms up again. If you want to keep grass green in winter, consider a grass like Kentucky bluegrass, which maintains its color year-round.