Answer: Some weeds can be smothered with a layer of newspaper or cardboard topped with a thick layer of mulch, yes. This process takes a long time however and some deep rooted perennial weeds will actually manage to grow through the smothering layer. This plant has strong root reserves. It can eventually be weeded out by pulling all successive shoots to exhaust the root, and it can be stopped by smothering and possibly resmothering over time, or by a combination of the two methods. However, for fastest results you might try an herbicide containing glyphosate. You will also want to be sure not to allow it to set seed and thereby plant more.
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