Choose a day at least a year before you plan on planting in the area. For best results, spray Ortho Ground Clear weed killer before any weeds appear. Apply the spray on a day that is warmer than 60 degrees F.
About this Author
Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.