I'm putting up a fence along the back of our property. I plan on mulching only under the fence and about 6 inches to 1 foot out on either side. I want to prevent anything from growing in this zone and am looking for opinions on what has worked for you? I've heard of salting the area. I know there's landscape fabric, but I want something a little more permanent as it seems most of those dissolve after a couple years. Any thoughts would be much appreciated!