Cow vetch is not invasive in Vermont, but is in some other states. Vetch is not on the list of the Vermont Invasive Exotic Plant Committee. Cow vetch is not native to Vermont. But it is everywhere in every field and meadow. Cow vetch is also called tufted vetch and bird vetch. Crown vetch is a different species and is purple and white and can be confused with clover. Cow vetch is good cattle food and enriches the soil. Cow vetch is also a great source of nectar for birds and butterflies.