Lawns seeded in spring tend to get weedy, which is one reason why autumn is the recommended time for planting cool-season grasses (such as Kentucky bluegrass and tall fescue). Before applying an herbicide, wait until new turf grows enough that it requires mowing three times. Young grass plants are sensitive to weed killers and may be damaged if the herbicide is sprayed too soon.

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Tips On Preventing Weeds

• Watch how to weed your garden.
• Our guide to controlling weeds in your garden.
• Did you know? Vinegar is a weed killer.