Roundup for Lawns Crabgrass Destroyer Ready-to-Use kills even the toughest crabgrass without harming the lawn. Whitening occurs 4-7 days after application. Product may be applied when daytime temps are between 45-90 degrees. May be applied before seeding. Ideal for use on Kentucky bluegrass, fine fescue, perennial ryegrass and tall fescue.

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