Idaho OnePlan recommends the website of the Idaho Weed Awareness Campaign as the best resource for up-to-date information about Idaho's noxious weeds, and their control.
Source for this page: Idaho's Noxious Weeds by Robert H. Callihan & Timothy W. Miller

BACKGROUND

Meadow hawkweed (Hieracium pratense) came to the U.S. from Europe. This weed reproduces by seed, stolonsA creeping stem along the surface of the ground, and rhizomeA creeping, underground stem and generally inhabits moist grasslands.

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DESCRIPTION

Meadow hawkweed is a perennialPlant that lives for more than 2 growing seasons weed with shallow, fibrous roots. Leaves are hairy, up to 6 inches long, spatula shaped, and almost exclusively basalAt the base of plant or plant part. StolonsA creeping stem along the surface of the ground are extensive, creating a dense mat of hawkweed plants that practically eliminates other vegetation. Stems are bristly and usually leafless, although occasionally a small leaf appears near the midpoint. Stems can reach a height of 3 feet and bear up to thirty inch flower heads near the top. Flowers are yellow and appear in late May or June. Stems and leaves exude milky juice when broken. Seeds are black, tiny, and plumedA hairlike or featherlike structure, often on a seed.

DISTRIBUTION

Meadow hawkweed is found primarily in northern Idaho and eastern Washington.

CONTROL

No biological control agents are available for meadow hawkweed. Periodic application of selective herbicides applied to grass pastures in the early spring and followed by nitrogen fertilizer can keep the weed suppressed for 2 or more years.