Overseeding
When it comes to cool-season lawns like Fescue, seeding the fall is best because it gives the seedlings all winter and spring to develop a healthy root system to help them survive the hot temperatures of the summer. While spring seeding will germinate quickly and look good, the roots never fully establish before the heat and will generally completely die out by early summer.
Lawn seeding or overseeding as it is also commonly named is a process of spreading grass seed over already existing turf. It is best to seed larger areas where the turf is thin, but not bare. You can then spot-seed smaller areas that are thin or infested with weeds.
The benefits of seeding for your lawn are numerous and include filling in areas of turf damaged by summer stress, diseases, or insects, thickening and increasing its density, improving the lawn’s overall appearance, and enhancing its ability to fight insects and disease.