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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.

The best time to plant is between spring and autumn. Springtime weather is typically mild and is when nurseries start to bloom. When the summer weather arrives and it’s hot out, it’s best to avoid planting bare-root plants, but you can still plant many in-container varieties. The first sign of fall is another great opportunity to plant biennials if you live in southern states, or a lovely vegetable garden up north.

Spring or early fall presents ideal conditions—cooler temperatures with consistent rainfall support hydration and growth.

If your grass is stressed from being over-trimmed, try watering it heavily and then allowing it to recover for at least two weeks before mowing again. If you notice brown patches where the grass has died off because it’s too short, you should remove the dead grass and overseed the area. Leaving dead patches can invite weeds and other problems, so if you want a totally green lawn, getting rid of dead patches should include removing the dead sections before reseeding the area.