Pro-5 Weed- Barrier is the industry"s best 5 oz. woven, needle-punched, polypropylene fabric designed for professional and commercial use. Pro-5 Weed-Barrier has been a approved by leading landscape architects and most government agencies. Pro-5 conserves soil moisture, increases growth, and prevents unwanted weeds from germinating. Twelve-inch spaced lines make for easy plant alignment.