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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.

When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.

Fescue grass is a relatively low-maintenance grass type, meaning it doesn’t require much more attention than regular watering, dethatching, and mowing. Some fescues even grow slowly enough for hard-to-reach areas, particularly those inaccessible by the mower. Following a seasonal maintenance schedule will help your fescue lawn stay green, healthy, and durable for years to come.

If the grass is dead, you cannot bring it back to life. However, you can grow new grass in its place or try the methods mentioned above to revive the grass if it isn’t entirely dead. You can expect St. Augustine grass to come back after moderate droughts, but it will suffer significant nutrient loss after an extended period of drought.