Bermuda grass is a warm weather grass. When the temperatures turn cool, the Bermuda turf will begin to turn brown. Planting perennial rye grass in with Bermuda grass will aid in keeping a green turf to the lawn almost year-round. According to the University of California, Davis, the common perennial ryegrass will last more than one warm season. When planted during the proper time of year, it can provide a year-round green look to the lawn, especially when you overseed a Bermuda lawn.
Lower the mower setting to the Bermuda lawn down to 1 ½ inches in height. Mow the lawn the last couple of weeks in September to the first couple of weeks in October at this lower setting.
Reduce the irrigation to the Bermuda grass lawn by half during the same time. This will reduce any stress placed on the established Bermuda grass lawn.
Broadcast the rye grass seed over the lawn from mid-October to mid-November at a rate between 8 to 10 lbs. of seed per 1,000 square feet.
Top-dress the freshly laid seed with approximately 1/8 to ¼ inch of sand. This will cover the seed under the Bermuda grass turf blades and increase the germination rates.
Irrigate the new seed with between ¼ and ½ inch of water every day. After the seed begins to emerge, water the seedlings with the same amount of water, but three times to four times daily. Reduce the amount of water as the grass begins to mature or reach 2 inches in height.
Mow the new green lawn when the overall height of the rye grass reaches the 2-inch level. Lower the mower deck to 1 ½ inches. This will be approximately two weeks after initial over seeding.