Mike from Currituck, Nc writes
Southern Ag Atrazine Weed Killer for St Augustine Grass would be applied whenever the target weed is actively growing and healthy in your area. Best results are usually obtained when applied in early spring or dormant periods when weeds are small or have not emerged. The only temperature restriction on the label is to not apply when the temperature is above 90 degrees.
Answer last updated on: 06/05/2019