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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.

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.

It’s best to fix lawn depressions during late spring. You want to wait until after your last frost date and when the yard is not too wet. This also allows ample time for new grass growth once you reseed.

In the fall, you should aerate the soil, overseed the bare spots, kill weeds, mow the lawn low, and rake your leaves. By boosting your lawn’s health in the fall, your grass will be stronger throughout the winter and come back healthier in the spring. You should also trim your perennials so that they withstand the winter and are ready for new growth in the spring.