Black swallow-wort is considered a early detection species not present or with a limited distribution in Minnesota.
Appearance: Perennial, herbaceous vine in the milkweed family. Vines can grow up to 6 ft long.
Leaves: Opposite, lance-shaped, with smooth edges.
Flowers: Purple flowers with yellow center, five petals with small hairs on the petals, flowers arranged in clusters from the leaf axils. Flowers from late May to mid-July.
Seeds: Seeds are in milkweed seedpods 1.5 - 3 inches long. Seed pods open in late summer and early fall and release wind-borne seeds on silky filaments.
Report black swallow-wort by emailing "Arrest the Pest" or calling 651-201-6684 (metro) or 1-888-545-6684 FREE (toll-free)
- Minnesota Noxious Weeds (MN DOT)
- Video on Black swallow-wort identification (University of Wisconsin)
- MISIN black swallow-wort identification training module
- US Forest Service Fact Sheet
- Wisconsin DNR Fact Sheet