Pre-emergent Weed Killer One of the most effective ways to control weeds is to apply pre-emergent herbicide, a chemical that prevents unwanted growth from appearing.
Contrary to popular belief, pre-emergent weed killers don't destroy weeds and their seeds. They simply stop them from growing. There is no silver bullet that kills all weeds and an effective program adjusts to the needs of the property on a seasonal or annual basis. While fighting weeds is a year-round job, weed prevention is best practiced in the fall and early spring to take advantage of the growing season of turf grasses. A healthy, thick lawn is your number one defense against weeds.