To eliminate unwanted weeds, a lawn has to be kept to the highest standard, promoting the growth of the wanted grass and eliminating plants that do not belong. Chemicals kill weeds before their seeds germinate and destroy existing weeds. Weeds can ruin the appearnce of a lawn and must be controlled to ensure a uniform look. Proper chemical and cultivation controls eliminate weeds with minimal work.
Mow the grass according to the height specified by the variety, removing no more than 1/3 of the grass blade at a time, as this kills the grass.
Remove plugs of dirt from the lawn with a core aeration machine to ease compaction and increase grass coverage.
Test the soil for pH levels and follow the recommendations of that test.
Apply a pre-emergent herbicide such as isoxaben three weeks before weeds germinate. Application in early May is best. Follow the directions on the packaging for dosage details.
Spray a liquid-based post-emergent herbicide containing 2,4-D, MCPP, dicamba, triclopyr, MCPA to the leaves of the weeds after they appear. Spray when winds are calm to prevent unwanted spread of the herbicide. Follow the label instructions.