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Technically, yes, at least some of the grass seed you throw on the ground will germinate. If the area doesn’t have good drainage, rain or overwatering can move seeds before they have germinated, leaving your patches still patchy. What does grow won’t have strong roots if there isn’t proper aeration.

This depends on the type of grass seed, as some types do better in different environmental conditions. Cool-season grasses go dormant during the summer months when the soil temperature exceeds 65 degrees Fahrenheit. Once exposed to regular doses of heat, the germination rates decline, with seedling death not far behind. 

As for warm-season seeds, they come from tropical parts of the world and thrive in heat. They actively grow in warm air temperatures between 70 and 90 degrees Fahrenheit, and they prefer soil temperatures between 65 and 70 degrees Fahrenheit. Once temperatures dip and frost rolls in, if you don’t store them properly, warm-season grass seeds will die quickly.

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.

The best grass type for shady areas depends on your region, your preferences, and your yard’s microclimate. Overall, the best cool-season grass for shade is ryegrass or tall fescue, while the best warm-season grass for shade is St. Augustine. But again, this can depend on what you’re looking for in the grass. The best grass for your shady yard might be one that looks good to you, one that tolerates high foot traffic, or grass with other characteristics that make it fit your lawn needs.