Crabgrass killer formulated with a proprietary active ingredient that kills even the toughest crabgrass. Whitening occurs 4 to 7 days after application. May be applied when daytime temperatures are between 45 and 90 degrees Fahrenheit. May be applied before seeding, including the day of seeding. Ideal for use on Kentucky bluegrass, fine fescue, perennial ryegrass, and tall fescue. Will not harm the lawn. Active ingredient: Topramezone. Glyphosate-free.