The best way to prevent weeds is to have a thick, healthy lawn. A thick Bluegrass or Fescue lawn prevents weeds by starving them of both nutrients and sunlight. However, it is often difficult to cultivate enough thickness for an adequate defense.

Professional lawn care companies can either take a proactive or reactive treatment strategy to weed control. The best lawn treatment companies follow a proactive, weed-prevention strategy. To prevent weeds, they treat the lawn for grassy weeds with a pre-emergent. Reputable companies know the value of timing herbicide treatments to the moments when weeds are most susceptible. Spot spraying reduces herbicide use.