Peter, We reseeded our lawn a couple of weeks ago and the new grass is growing in but it still looks very patchy. I used the recommended setting on the spreader but I think that heavy rain storm we had last week lifted and washed away a lot of grass seed (I saw a lot in puddles by the road at edge of the lawn )How long should I wait before I start to try filling the bare patches? Will the grass grow or spread out? I don’t want to disturb or destroy the new grass that has grown in with loosening the soil again etc. but I don’t want anything to start invading my lawn again either in the bare spots. Can I just drop some grass seed on the bare spots without and keep it watered or will this not work? Thanks again for all your help!
Fescue and bluegrass seeds take about 2 weeks just to sprout. At first there is a single blade but each will grow into a clump of grass covering about 2″ by 2″ square. Over time they will fill in even more. Since the pesky storms have washed the seed around you may want to overseed the worst areas. You can do it right away just remember that you’ll need to keep it watered even as the other grass matures. Starting a lawn from seed is a tricky task because of the constant light watering necessary. These thunderstorms aren’t helping the situation either.