Type in home lawn weed control Georgia University and look that over. Another is to type in Millie Davenport on You Tube. Winter weeds and grasses are best controlled early in their life cycle after they emerge or before they emerge. The grass ones seem to be best controlled before they germinate. You are way late in other words. The grassy winter weeds and the chickweed will not last long after fairly hot weather arrives. The other letuce like broadleafs can be controlled with broadleaf herbicides in the spring when the weather warms and active growth is going on. Best control on all these winter broadleafs weeds is soon after they emerge in the fall. Weed control is a yearlong endeavor, planning and dates are rather important. The information from your university will have these dates.