DeWitt Weed-Barrier 6 Year 3ftx100ft 6 year weed barrier is a 1.5oz/sq.yd. fabric and the best entry level fabric on the market. It is easy-to-use, environmentally safe fabric that controls weeds before they start. The non-woven, hydro philic treated fabric allows air and water to pass through. Dewitt landscape fabric minimizes light penetration to suppress weed growth. Fabric is treated to minimize degradation due to UV light exposure.