1. Heat and drought dormancy
Likelihood: HighHot weather and low soil moisture are the main reason Kentucky Bluegrass turns brown in summer. The grass reduces leaf growth to protect the crown, especially in sunny, exposed lawns.
Identification
- remove_circle_outlineBrowning is broad and fairly even across hot, sunny areas.
- remove_circle_outlineThe lawn stops needing frequent mowing.
- remove_circle_outlineCrowns near the soil line feel firm instead of hollow or rotten.
- remove_circle_outlineGreen-up begins after rain, irrigation, or cooler nights.
The Fix
- 1Decide whether you want active green turf or survival dormancy before changing irrigation.
- 2For survival watering, apply enough occasional moisture to keep crowns alive during long dry spells.
- 3For active turf, use deep watering rather than daily light sprinkler cycles.
- 4Keep traffic off dormant areas because dry crowns and soil are easier to damage.
- 5Wait for cooler weather before judging whether renovation is needed.