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Whether landscape fabric helps prevent weeds for a year or two seems pretty irrelevant to me when you consider the inevitable disaster that will appear after a year or two of freezing and thawing soil (in places where that is an issue). Black stuff sticking out through the mulch all over the yard and absolutely no good way to fix it once it starts starts to show. Either cut out the exposed stuff or fultily pile on more mulch. Just my opinion but I will never use the stuff except somethimes under stone. And I don't know for sure about this but the smartest plant guy I've ever known told me that if a fabric is thick enough to prevent things growing up through it it is also thick enough to inhibit plant respiration, etc. and can be harmful to the landscape plants.
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