[onewhippedpuppy]

Don't waste your time with Home Depot or Lowes, they know nothing and sell generic national brand products. Find a good local nursery and talk to them about your issues, if necessary take in samples of the weeds. They should be able to advise you on products and correct time for application. They will also stock products that are specifically designed for use in your local climate and soil. I frequent a local place that has been a huge help to me.