Mr. Weedy says: You must remember that more does not always mean better. Applying double the suggested amount of weed controller can cause serious damage to your lawn, including killing your grass. Waiting about 60 days and reapplying more weed control can help get rid of any remaining weeds, and won’t hurt your lawn. Contact Weed Pro Lawn Care directly for help with your landscape projects. Additional reference sources include georgia organic lawn service or norcross lawn treatment.