Invasive Species: Butterbur

Butterbur

Also called Butterfly Dock or Pestilence Wort
(Petasites hybridus)
*Detected in Michigan*

Perennial, herbaceous flowering plant grows to 6 feet.
Simple, round to heart-shaped leaves are 1-2 feet across, with dense hairs on the underside.
Single leaves grown on hollow, ridged, 3-4 foot stems somewhat similar in appearance to rhubarb.
Flowers are pink to purple and grow on a spike that emerges before foliage in spring.
Fruit and seeds appear in a white, flower-like tuft.

Use the Midwest Invasive Species Information Network (MISIN) online reporting tool.

- Or - download the MISIN smartphone app and report from your phone.

Woman in a patch of butterbur in the woods

Michigan DNR

A red butterbur stalk with pink flowers.

Photo courtesy of William M. Ciesla, Forest Health Management International, Bugwood.org.

White, tufted seeds of butterbur on a stalk

Photo courtesy of William M. Ciesla, Forest Health Management International, Bugwood.org.

Habitat: Found in shaded areas with moist soil, including river banks, shorelines, wetland edges, forested floodplains and roadside ditches.

Native Range: Europe, Russia and Turkey.

U. S. Distribution: New York to Ohio; Illinois, Michigan and Washington.

Local Concern: Butterbur spreads easily by rhizomes or rhizome fragments. Large leaves shade out other vegetation, leaving bare earth beneath.

Invasive Species: Butterbur