Before I fergit.
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Something I always wanted to try under bark, wood chips, rock, whatever ground cover in amongst growing things. If you know anybody in the paving biz there is a fabric called Petromat that they use for overlays, a moisture barrier. Should be a weed barrier also. It's thicker than that black barrier the nurseries sell, has no chemical odor so I don't think it has any additives to help the paver that may harm the ground. Paving buddies might be able to get tailings and remnants after paving jobs for cheap.