I know I need to use it every now and then. Most of the fabrics have a weave type pattern that roots can grow into, or such as suckers from trees poking through. I've looked around, and found a fabric from DuPont. It has more of a "fiberglass" type look and weave to it. It seems like it would be the best for not letting weeds root into it, and not letting anything poke through. To me it's the best barrier on the market. I did a water test on it too, and found that most of the water did run off it, but, it is permeable and allows some moisture to penetrate unlike plastic weed barrier. My only question is, Lowe's is the only place that carries it. Is there a comparable product out there that you guys have used. I'm looking to buy bulk but I'm not going to pay retail unless I have too.