Stop wasting time pulling weeds and you"ll have more energy to enjoy your garden. Weed Block landscape fabric not only prevents weeds, it encourages root growth by keeping soil moist and cool. Made of UV-treated polyethylene, this cost-effective weed control fabric features patented "Microfunnels" that allow the free flow of air, water and nutrients to the soil while blocking sunlight � and weeds! For a chemical free, easy to use weed barrier, Weed Block is perfect for your garden and landscape areas.