DeWitt 3' x 250' Black Pro 5 Weed Barrier. This woven, needle-punched polypropylene fabric is professional grade and comes in bulk roll. It is 5 oz. and has a coverage of 750 sq. ft. Conserves soil moisture, increases growth, and prevents unwanted weeds from germinating. Twelve-inch spaced, colored lines make for easy plant alignment. Backed by a 30-day warranty.