Lawn Over-seeding Techniques

Mowing

• Mow your lawn slightly lower than normal to prepare the lawn for over-seeding, as suggested by the University of California. To mow your lawn lower, set the mower's blades at its lowest level but don't take off more than a third of the grass blade. Cut the grass so it is at a height of 1 1/2 to 2 inches, as recommended by Iowa State University. Close mowing also helps loosen the topsoil to prepare the lawn for seeding.

Dethatching

• Generally, established lawns will have a buildup of thatch, according to the University of California. A thatch layer over one-half inch can prevent grass seeds contacting the soil, inhibiting grass seed germination. A thick layer of thatch also prevents water from absorbing into the soil and to the new grass roots. Push a power dethatcher back and forth across the lawn and rake up the debris. After dethatching, push an aerator over the lawn to loosen up the topsoil for seeding.

Seeding

• The correct distribution rate for your grass seed depends on the type being grown. For example, Bermuda grass seed should be distributed at a rate of 1 lb. per 1,000 square feet of lawn. Pour half of the seeds you intend to use and distribute horizontally over the yard. Apply the other half of the seed vertically over the lawn to achieve an even coverage of grass seed. Apply an eighth inch of compost over your grass seed with a rake to help the seed stay moist, recommends the University of California.

Caring for Seedlings

• Water your newly seeded lawn twice a day to keep the seeds moist, Iowa State University reports. Continue to mow the established grass to 1 1/2 to 2 inches in height to prevent the grass from competing with new seedlings for the soil's nutrients, sun and air. When seedlings reach heights of 1 1/2 to 2 inches, raise your lawnmower blades and keep a grass height of 3 inches.