Not only does warm air temperature favor Bermuda grass growth, so does warm soil temperatures. Roots and stolons grow when the soil temperatures remain between 65 and 80 degrees. Without strong root growth, leafy green growth doesn't flourish in warm weather.
When temperatures are appropriately warm, application of a nitrogen-rich fertilizer in increments every three to four weeks promotes faster and lusher Bermuda grass growth and coverage. Don't fertilize when temperatures are cool and the grass is dormant, and thatch is brown.
Richard L. Duble of Texas A&M University adds that weed control helps Bermuda grass establish and grow better. Although the grass is drought tolerant, maintaining a moist soil in the warmth of late spring to early fall also increases the grass growth and health.