I would advise you to use smaller rocks, like pea stone. The smaller the rocks, the tighter they pack together. Although rocks will never prevent weeds, tightly packed smaller stones will block weeds more effectively than larger rocks with space between them. Also, putting a weed barrier over existing weeds is worse than no barrier at all. The weeds will just grow through the barrier and the mat will prevent you from pulling the weeds out and getting the root. If you put down a barrier be certain to remove all the weeds, roots included, before placing the barrier. Good luck with your project.
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