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NW Washington | The first step would be to identify the kind of vetch you are dealing with as there are several kinds. Some like crown vetch spread by roots and others only by seed. About the only thing I can think of is clean cultivation or fallowing the ground. Using Roundup or some other herbicide would sure be a lot easier, but do what you must. http://www.dnr.state.wi.us/invasives/fact/crown_vetch.htm | |
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