Mouse-Ear Hawkweed

Pilosella officinarum

A low-growing perennial with yellow-white dandelion-like flowers and leafless stalks covered in stiff hairs. (Also known as Hieracium pilosella.)

Life Forms	Forb
Habitats	Forests & Woodlands Grasslands & Oak Savannas
ODA Listing	A
Soil and Moisture Conditions	Low fertility soil
Suggested Actions	Report to Oregon Invasives Hotline
Shade Preference	Full sun
Mature Height	3-10"
Distribution	Found in North East and North West US. Very limited distribution in Oregon's Willamette Valley.
Control	Do not mow. Hand dig if only a few plants. Fertilize the soil to help keep mouse ear hawkweed from establishing in lawns or pastures.
Disposal Methods	Seal plant material in a plastic bag and throw away in the trash.
Reproduction and Spread	Spreads by stolons that form dense mats and by wind-borne seeds.
Introduced	Introduced from Europe to US as an ornamental or agricultural seed contaminant.
Look Alikes	dandelions; other nonnative yellow flowered hawkweeds- they hybridize and are difficult to tell apart.
Impact	Produces thick mats of rosettes that prevent other plants from establishing. Reduces desirable pasture forage production.
More Info	https://www.oregon.gov/ODA/shared/Documents/Publications/Weeds/MouseearHawkweedProfile.pdf https://tualatinswcd.org/wp-content/uploads/2021/06/2021_Mouseear_Hawkweed_BMP.pdf