When is the best time to reseed my lawn
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First determine if you turf type is a type that needs to be reseed.
Second Determine if you want grass that goes dormant to be over seeded with a perennial grass.
What you don’t want to do is over seed your Bermuda or Zoysia lawn. That will be a waste of time and money. However, you can over seed with a perennial rye that will keep your lawn green all winter. You will need to continue to mow your lawn all winter as well. This isn’t something I see a lot of in the Cumming Georgia area. If there are areas that has been under stress or has drought damage you can in the spring dethatch and sand or cut out areas and patch with sod.
If you have a fescue lawn this is where we want to talk about re-seeding and doing it every fall. Pick you a good turf type seed and for best results this needs to be done between the first of September and mid-October. You can aerate and re-seed later into November but if the temperatures are cold the seed may not germinate and that could cause the seed to lay dormant till spring. It is possible that a good amount of the see will germinate and come up in the spring.
If you see a lot of dead grass down in the turf it is good to first have a dethatcher or power rake ran through the turf to pick most of that out and blow or rake it off. Then you can aerate the lawn with a core type aerator. The spike aerators will work but I believe that removing the cores will accomplish a lot better for the soil and getting the seed down into the soil. Aerating is good for compacted ground, opening holes for better water penetration, and allowing oxygen to get to the roots. Once this has been done you are ready to spread your seed. Spread 5 to 10 pounds per 1000 square feet. Water with a good soaking 20 to 40 minutes per day for the first 7 days. This should get you off to a good start.