Rake your Bermuda grass lawn with a flexible garden rake to remove any thatch, stones or other debris.
Water your lawn thoroughly with a garden hose or sprinkler system to moisten the soil before sowing your zoysia grass seed. Provide enough irrigation to moisten the soil to a depth of 4 to 6 inches.
Distribute half of your zoysia grass seed in a single direction over your prepared lawn. Turn 90 degrees and distribute the remaining zoysia grass seed. Distribute the zoysia grass seed by hand or use a seed spreader, if desired.
Cover the freshly sown zoysia seeds in your Bermuda and zoysia grass lawn with a 1/2-inch layer of peat moss. Avoid adding any more than a 1/2-inch of peat moss or you will make it more difficult for your seeds to germinate and sprout successfully.
Water your lawn daily to keep the soil moist. Reduce the frequency of watering to just two to three times a week once new zoysia grass growth is observed.