How to Plant Grass Seed on an Existing Lawn


With preparation, overseeding reduces weeds, thickens lawn turf and fills in bare areas. Overseed lawns during the months of September and October. Use the same amount of grass seed as required for seeding a new lawn, and use the same type of seed that is present in the existing lawn. Use overseeding to thicken your lawn instead of hiring a landscaper or lawn specialist to do the work.

Step 1

Set the lawn mower blades to a 1-inch cut. Start at the corner of the lawn and mow back and forth in straight rows.

Step 2

Rake the lawn with a wide-tine rake to remove small twigs, rocks and other debris.

Step 3

Rent a lawn aerator, if you do not own one. Start at the corner of the lawn and roll the aerator back and forth in straight rows over the entire lawn surface.

Step 4

Water the lawn with 1 inch of water. Allow the water to penetrate soil for 30 minutes.

Step 5

Fill a seed spreader with grass seed that is identical to the seed currently in the lawn. Follow the recommendations on the bag to determine spread amount.

Step 6

Water the lawn with 1 inch of water once again. Repeat watering every other day for 14 consecutive days.

Tips and Warnings

  • Avoid walking on the lawn for 14 days from the first day of sowing new grass seed. Avoid cutting the lawn for one month from the first day of sowing new grass seed.

Things You'll Need

  • Lawn mower
  • Wide-tine rake
  • Lawn aerator
  • Water
  • Lawn seed
  • Seed spreader


  • "The Lawn Bible: How to Keep It Green, Groomed, and Growing Every Season of the Year"; David R. Mellor; 2003
Keywords: overseeding lawns, lawn maintenance, landscaping care

About this Author

Lisha Smith writes for several blogs and has freelanced for six years. She has a Bachelor of Arts from UNC-Greensboro in psychology. Smith has self-published several books. Her areas of experience include gardening, cooking, home improvement, pets and mental health.