Astragalus danicus, known as purple milk-vetch,[2] is a species of flowering plant in the family Fabaceae (legumes), which is native to Europe.

[5][6][7] Astragalus danicus ranges across Europe from Ireland and subarctic Russia south to the Alps and central Ukraine.

[3] It grows on short, unimproved and dry grassland, usually over limestone or chalk, but can also be found on sand dunes, sandstone sea cliffs, machair and over mica-schist.

[5] The species is non-toxic and its common name in English comes from the popular belief in history that cows fed with purple milk-vetch yielded more milk.

[5] In the United Kingdom Astragalus danicus has vulnerable status and has been a Biodiversity Action Plan priority species since 2007.