Mouseear hawkweed

Prepared by Jennifer L. D’Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. March 2011.

Scientific name: Hieracium pilosella L.

Common name(s): mouseear hawkweed

Link(s)USDA PLANTS Profile

Images: (to see enlargements [PC]: click on image, then right click and choose “view image”)



-leaves are

  • simple
  • alternate
  • basal

-considered noxious in some states

-generally flowers May to July in ME

-generally fruits July, August in ME


-can establish in low nutrient and over grazed sites

-disturbed sites

-meadows and fields

Natural History:

-native to Europe

-introduced to eastern and northwestern North America



Hansen, R.W., S.B. Hansen and E.A. Osgood. 1991. Reproductive phenologies of selected flowering plants in eastern Maine forests. ME Agric. Exp. Station Tech. Bull. 143. 17 pp.

Heinrich, B. 1976. Flowering phenologies: Bog, woodland, and disturbed habitats. Ecology. 57(5):890-899.

Go Botany. “Hieracium Pilosella L.” Hieracium Pilosella (Mouse-Ear Hawkweed): Go Botany, 2021,