Weed Control Begins With Proper Management
Proper management practices that encourage a dense, thriving turf are the best method of weed control. Healthy turf shades the soil so sunlight can't reach weed seeds ready to germinate. A thick turf also minimizes the physical space available for weeds to become established. There are several management practices that will promote a healthy, dense grass.
Proper Turfgrass Selection
Proper management begins with selection of the best turf species or variety for a particular area. For example, heavily shaded areas will support only a few turfgrass species. This results in thin, weak turf that is very susceptible to weed invasion. Good grass choices for shady conditions would be certain cultivars of St. Augustinegrass, zoysiagrass, and to a lesser degree, centipedegrass.
Proper Cultural Practices
Proper fertilization, watering, mowing, and control of other pests are required to produce a dense turf that will prevent weed infestation. If turf is over-or under-watered, over-or under-fertilized, or mowed too low or too infrequently, the turf is weakened and cannot compete with weeds. Damaged areas resulting from using unsharpened mowers increase time needed for turf recovery, allowing for weed invasion. It is very important to understand that weeds don't create a void, they fill a void.
It is extremely important to prevent the introduction of weeds into lawn areas. A good practice is to wash off mowers and trimmers used in weed-infested areas before mowing or trimming in weed-free areas. Similarly, rototillers should be thoroughly cleaned prior to and after using to minimize dispersal of weed seeds found in the soil. Yard clippings that contain weeds should be properly disposed of or composted to reduce the possibility of unwanted contamination.