Answer: Both of the plants you listed are notoriously difficult to eradicate. You could try using an herbicide containing glyphosate, a nonselective herbicide. It will definitely require more than one application, so begin now. This will allow time for the plant to recover using its stored root reserves and resurface so you can reapply it. Be sure to allow the full time for the chemical to be translocated from the foliage to the root where it actually kills the plant. Read and carefully follow all of the label directions. Your local county extension may have additional suggestions on what to use on specific plants in the bed. Best of luck with your project.
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