Mare's Tail

A mare’s tail plant can stand like a thin green brush at the edge of pavement, its tiny flower heads easy to miss until the seed fluff appears. The first community record behind this page came from Massachusetts, United States on 2026-06-15. A species profile begins with that ordinary act of noticing, then asks what the plant is doing in its own season and ground.

Mare’s Tail (Erigeron canadensis) is easiest to meet through visible structure before names get complicated. Look for tall narrow annual habit, alternate slim leaves, and tiny heads and white pappus. Those details matter because several relatives or garden forms can share a color, a shape, or a common name. The strongest field view is a whole plant plus one close look, enough to connect habit, leaves, flowers, and setting. ²

Range gives the plant another kind of biography. POWO treats Erigeron canadensis as native across much of the Americas and introduced widely elsewhere. The map now draws those cited native and introduced units alongside GBIF observations, so the colored areas are source-backed range regions and the dots remain observation records.

The ecological story is small but active. Mare’s tail is most at home where soil has been opened by disturbance, from field edges to pavement cracks, and its seedbank lets it answer bare ground quickly. Wind seed travel is part of the same picture, because flowers, fruit, seeds, or cones move through living visitors and weather rather than standing alone. A reader in the field can notice the ground first: shade or sun, disturbed soil or forest humus, rock or garden bed, then the plant rising from it.

A final look returns to narrow leaves, tiny heads, and white pappus built for wind. Compare the plant with the disturbed ground around it, and the land-growing fleabane separates from aquatic namesakes.