Weeds are defined as unwanted plants. The first and best method of weed control begins with proper maintenance practices which will encourage dense, vigorously growing turf. Healthy turf shades the soil so sunlight cannot reach weed seeds to germinate. A thick turf also minimizes the physical space available for weeds to become established..
Bare areas in your lawn should be re-sodded to help prevent weed infestation as weed control cannot be accomplished in these areas.
Proper cultural practices also have a tremendous impact on weed control. Here are some conditions that will encourage weed growth.
Certain grasses cannot be controlled chemically. Bermuda, Alexander, and Torpedo Grass are some examples that can take over St. Augustine lawns. There are no products available that will provide pre or post-emergent control. Re-sodding is the only way to the situation and nothing will prevent these grasses from possibly re-infesting in the future.