Hairy vetch is an exotic invasive plant from Eurasia. It likes to grow in mesic soils in abandoned fields and disturbed areas. It was introduced to the United States and other areas as a forage crop and in organic farms for nitrogen fixation and as a ground cover to keep other weeds out. It fixes as much as 200 lbs./acre of nitrogen into soils, but can overtake a field as a weed very quickly. In my own experience I have not seen it as problematic as Crown Vetch, and have only seen it a couple of times in abandoned fields.
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