IDENTIFICATION
Regional Noxious. Biennial.
Marsh plume thistle is typically a single, slender, unbranched
stem with a cluster of purple flowers at the top. The upright stem, which
can grow to 2 m tall, is evenly covered in spiny wings. Leaves are deeply
segmented, hairy on the undersides, and have prominent woody veins.
DAMAGE
This weed does not occur in cultivated areas, but can spread in pastures
where it replaces desirable forage plants. It can invade moist fields
and meadows, replacing native vegetation and reducing forage for wildlife
and livestock. It forms dense stands that compete with tree seedlings
planted for reforestation.
HABITAT
It is well adapted to moist-to-wet openings, including pastures, bog and
fen communities, logged areas, and roadsides. Marsh plume thistle
occurs in the Cariboo, Vancouver Island, and Omineca areas and is most
common in the Robson Valley between McBride and Prince George.
SPREAD
Wind and water disperse the light, parachute-like seed. Ingestion of seeds
by birds may also disperse seeds.
