The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.

Common MulleinVerbascum thapsus L.

Photo from Weeds of the West, revised edition

Attribute	Information
Growth Habit	Large biennial, 2 to 6 feet tall.
Leaves	Rosette produces fuzzy leaves the first year. Leaves are alternate, overlapping one another, light green, densely woolly.
Stem	Large woody stem 2 to 6 feet tall.
Flower	Flowers are sessile, borne in long terminal spikes, sulfur yellow, 5-lobed and more than a 1 inch in diameter.
Roots	Large taproot.
Seeds	Small, angular, brownish seeds, 1/32 inch long.
Reproduction	By Seed
Habitat	Common along river bottoms, pastures, fence lines, waste areas, it especially favors gravelly soils.
Biological Control	Mullen Moth (Cucullia vebasci) & the European curculionid weevil (Gymnaetron tetrum)
Herbicides	2,4 - D, Cimarron, trichlopyr, & glyphosate