Centipede and bahia grass are very different types of grass but tend to work well when planted in the same area. Centipede is a warm-season variety with a shallow root system and fast growth. Bahia grass grows slowly but develops a deep and extensive root system. If you plant centipede grass in a bahia pasture, you create a vibrant, lush lawn that stays green through spring and summer.
Test the soil in the planting area to determine the pH. Bahia grass grows in a pH of 4.0 to 6.5; centipede grass needs a pH of 5.0 to 6.0. If the soil falls between 5.0 to 6.0, you can plant both types of grass without problems.
Amend the soil to make the pH more suitable for both grass types. If the soil is acidic, add hydrated lime to make it more alkaline. If you need to make alkaline soil more acidic, add ground rock sulfur. Follow the instructions on the packaging to determine application amounts.
Seed the centipede grass in the late spring when there is no longer a danger of frost. Insert a soil thermometer into the ground to make sure the soil temperature is 70 degrees Fahrenheit.
Cut the bahia lawn to remove 1/3 of the grass blade. Run a rake over the lawn to remove clippings that may prevent the grass seed from touching soil. Also use it to scrape at the ground, so that some soil is visible throughout the lawn.
Fill a seeder with centipede grass seed. Run it over the planting area to spread the seed at a rate of 1/2 lb. per 1,000 square feet.
Cover the centipede grass seed with 1/4 inch of compost. This will keep it in place and help it sprout faster.
Water the lawn with 1 inch right away. Keep the soil moist from then on until the grass is 1 inch tall. After that, you only need to water it once a week.