- 1). Time overseeding your grass from two to six weeks before fall's first killing frost.
- 2). Trim Bermuda grass to 1 inch tall with a lawnmower. This allows light to penetrate the soil and gives grass seed the chance to sprout.
- 3). Measure the thatch level of soil and dethatch your lawn so it is less than 1 inch thick. Thatch is a buildup of grass roots, dead grass stems and debris among the grass roots and soil. To remove thatch, rent a dethatching machine, which operates on your lawn similarly to a lawn mower. Position your dethatcher at one end of your lawn and start it with the pull rope. Push the machine over your lawn in strips.
- 4). Rake up the debris left by the dethatcher and bag them for disposal.
- 5). Aerate your soil using a core aerator to remove cores of soil and grass from your lawn. This allows moisture, nutrients and air to penetrate the soil. Rented an aerator from a hardware or lawn care store and operate it like a lawnmower. Pass the aerator over your lawn up to four times, varying the direction of the pattern. When finished, there should be between 40 and 60 cores per square foot removed from your lawn.
- 6). Top dress your lawn with a layer of compost. Spread the compost over your lawn in a 1-inch layer and work it into the root zone of your grass with a leaf rake.
- 7). Fill a broadcast spreader with a winter grass such as rye or bluegrass. Set the spreader to distribute seed at a gradual rate, then push the spreader over your lawn in sections.
- 8). Water your lawn up to four times daily using ¼ inch of water per 1 inch of soil to keep the lawn as damp as a wrung-out sponge. This allows your grass seed to germinate. Reduce watering gradually to 1 inch of water every 10 days.
- 9). Mow the lawn to keep the Bermuda low enough that your cool season grass can germinate. When the new grass reaches the same height as the Bermuda, raise the decking on your lawnmower to 2 inches.
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