I recommend the weed mat. The thing is not to go with the cheapest (I once found rolls for 2.00 at a dollar store). Well, after mulching over the top of it, within a couple of months, the fabric began deteriorating. So I would go with one that is going to stand the test of time, and not necessary the most expensive one either. If you prepare the area first, spray some sort of herbicide, allow it to dry overnite, and then lay the fabic, it will even be more effective. But as previous posts mentioned, nothing is weed proof.
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