A Great Tip from Trash Talk: Cardboard Reuse

Cardboard works great for weed control in the yard or garden. Lay out the flattened cardboard first making sure to overlap it by at least six inches. If the weeds are very established or if your weeds are more like small shrubs, do a double or even triple layer to ensure nothing grows through. We found that it is best to wet the cardboard with a sprinkler to soften it before applying the top layer of bark mulch or gravel so the cardboard will settle in and smother all the weeds completely. In as little as one year the cardboard will have composted into a rich loamy soil while the weeds have been killed off by lack of sunlight and air. Simply top off the bark mulch periodically as it too breaks down over the years.