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Adding seed to existing grass is often known as overseeding, as opposed to reseeding. Reseeding refers to the process of filling in bare or dying patches of lawn—or in some cases, full lawns—whereas reseeding supports existing lawns to prevent thinning. Overseeding is an ideal annual lawn care practice for grass fighting drought, disease, weeds, or pest issues.

While it’s possible to grow grass seeds by throwing them down, this isn’t the best way to plant them. By amending and prepping the soil beforehand, you’re providing optimal contact between seed and soil for a better chance at germination. If you throw them down without preparing the soil beforehand, seeds are more likely to blow away, get eaten by hungry birds, or never grow.

Those who live in between zones may have summers too warm for many cool-season grasses and winters too cold for warm-season grasses. Grasses selected for these climates must be well adapted to both conditions, so opt for tall fescue if your area is more prone to very cold temperatures or kikuyu grass if your home has notably hot summers.

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.