Fertilome Weed Free Zone Home Lawn Weed Killer Contains Several Active Ingredients Including Carfentrazone and Ester. Weed Free Zone is a post emergent herbicide that kills a wide variety of broadleaf weeds. Excellant for spot treating weeds. Rainfast in 3 Hours. Shows results in 24 hours. Works in a wider temperature range. Kills a wider variety of weeds. May kill creeping charlie with one application. Do not seed for two weeks after spraying. Do not spray on new sod until it has been mowed four times. Do not spray on new seeding until it has been mowed twice. Again, as with all broadleaf weed killers, do not get this chemical on trees, flowers or shrubs as it will kill anything with a broadleaf. 24 Oz. Spray Bottle Of Ready To Use.