It has been said that this plant can be an effective weed, and nematode control when used as a cover crop. Having said that though, there are some agencies that do list this as a noxious/invasive weed. As for "fighting" weeds…I'd be interested in knowing how they came about this assumption…Maybe it would "take over" an area ( thus being noxious/invasive on it's own ) and crowd out 'other' weeds. Maybe ones persons 'weeds' is another persons 'ground cover'.
