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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.

Although these terms sound similar and are sometimes used interchangeably, overseeding and reseeding your lawn are very different processes. Overseeding, the simpler of the two, involves a few steps to restore thinned or patchy grass by raking, aerating, and seeding uneven areas of turf to promote regrowth.

Reseeding a lawn is a more drastic and involved process, often necessary if the lawn is diseased, more than a third dead, or very overgrown with weeds. Unlike overseeding, it requires removing most of the existing lawn and starting a new one from scratch, a much bigger and more time-consuming job.

Choosing the right grass seed and planting it at the right time are the most important factors in establishing fast-growing grass. You also need adequate water, sunshine, and nutrients. To speed up the growth process, you can implement some tips and tricks, including watering it deeply and frequently, and using an iron-rich fertilizer to boost its appearance.

The best time of year for power seeding depends on your local climate. The soil should be warm, but the air should be cool. If the weather gets too hot after you grow new grass seed, it can die off easily. The best time for power seeding warm-season grasses is late spring to summer, and the best time for power seeding cool-season grasses is in the fall.