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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.

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.

Common options include Kentucky bluegrass, fescue, and ryegrass. Choose based on climate and lawn usage.

Technically no, but they can look very similar and people often refer to the weedy grasses interchangeably. However, several differences keep these species separate. Crabgrass is often a darker color than carpetgrass and tends to sprout much earlier in spring. When allowed to grow out, crabgrass grows stems outward from the center of a stalk in a star-like pattern, which carpetgrass does not have.