Bird Vetch purple flower weed vine among crops

Tufted Vetch, Vicia cracca. Name also: Cow Vetch, Boreal Vetch, Bird Vetch. Cow vetch is widely used as a forage crop for cattle, and is beneficial to other plants because, like other leguminous plants, it enriches the soil in which it grows by its nitrogen-fixing properties. Cow vetch is also much appreciated by bees and butterflies as a source of nectar. The plant may also be used to curb erosion. Owners of pet birds such as budgerigars often use cow vetch as a nutritious food; the birds are especially fond of the seeds but may also eat the foliage. Its utility as a cover crop and source of green manure has encouraged the introduction and naturalisation of cow vetch far beyond its native range. In North America the plant is naturalised from southern Canada to northern South Carolina; it is considered an invasive weed in some areas and its sale may be regulated[citation needed]. Cow vetch is considered by some to be a potentially detrimental species in areas where it is not native. The vetch may crowd out native plants, especially in areas of disturbed soil where the vetch may dominate before other plants have a chance to take hold. This is especially a concern in prairie and other natural habitat restoration or land reclamation projects in North America.

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