Here is a great way to keep out the weeds. Do not get rid of that old shower curtain because you can put it right under the mulch so that you will not get those annoying weeds. They do sell products that you can put under your mulch but why waste you money when you can just use something that you already have. This will be sure to to stop any annoying weeds from popping through that mulch. This is just as easy to use as the products that you by at the gardening stores!