Horseweed; Marestail; Canadian Fleabane

Erigeron canadensis (Conyza canadensis)

Family: Asteraceae

Plant Description: Annual, 30 -180 cm tall with narrow slightly toothed alternate, lance shaped leaves 2-10 cm long. Flower heads in panicles, 2-3 mm wide white or pinkish rays about 1 mm long with yellow centers. Stout plant with hairy stems.

Field Identification: Tall, erect plant with leave projected upward and tight to stem (usually narrower than the flower inflorescence. Each flower in the inflorescence is atop a long pedicle. Has stiff hairy stems.

Occurrence: Common on various soils in pastures, wood, fields, and waste places. North American native but spread worldwide.

Bloom Time: Summer to Fall

Plant Use: Good nectar source and has traditional use to stop bleeding, as and astringent to dry mucous membranes and to flavor candy and condiments and soda. Young, boiled leaves are edible and have a spicy, tarragon-like flavor. Deer do not eat it due to its turpentine resinous and bitter taste. Attracts many beneficial predatory insects and parasitic wasps. Provides nectar for native bees and butterflies,

Plant Trivia: Considered a noxious weed due to its ability to spread rapidly and it is the first weed to produce glyphosate resistance. May be a skin irritant to sensitive skinned folks. Is a glyphosate resistant plant.

Key to genus if needed: