If a pre-emergent herbicide hasn’t been applied yet, do so immediately. Establishing a robust pre-emergent barrier is crucial before winter, as weeds become highly visible against dormant, brown Bermuda grass.
For existing weeds, over-the-counter herbicides from Lowe’s or Home Depot are generally safe for fall application, provided temperatures remain below 85°F. Note that cooler temperatures will slow the herbicide’s effectiveness, as weeds absorb the chemicals more slowly.
Celsius and Certainty remain effective options for fall weed control, although, like other herbicides, their efficacy will be reduced in cooler temperatures.
Timing and Efficacy
Be aware that the cooler it is, the longer it will take for herbicides to show results. Weeds metabolize herbicides more slowly in lower temperatures, extending the time required for visible damage.
Apply pre-emergent herbicides if not already done, especially to prepare for the winter months. For existing weeds, opt for over-the-counter solutions when temperatures are below 85°F or specialized herbicides like Celsius or Certainty. Adjust expectations for herbicide performance based on ambient temperatures. These strategies align with advanced turf management, ensuring a weed-free and resilient Bermuda lawn during the fall transition.