Lawns can reseed themselves, and it takes two months for most lawn grass varieties to produce seed heads. These heads then disperse naturally or with help from a mower, and take 7-30 days to germinate given enough moisture, sunlight, and heat.

Does grass naturally seed itself?

Regularly mowed lawns typically do not seed themselves because grass cannot produce seed unless it develops flowers. However, many species of grass are capable of spreading out vegetatively from side shoots that grow above or below the soil.

Does grass naturally fill in bare spots?

Those grasses have runners, meaning vine-like stolons above ground and stem-like rhizomes below ground. “They generate plants off the mother plant and will creep in and fill in bare spots on their own,” he says.