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Meadow Hawkweed
(yellow
hawkweed) Asteraceae (=Compositae), the aster family
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Background
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 Meadow
hawkweed came to the U.S. from Europe. This weed reproduces by seed, stolons, and
rhizomes and generally inhabits moist
grasslands. |
Description
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 Meadow
hawkweed is a perennial weed with shallow,
fibrous roots. Leaves are hairy, up to 6 inches long, spatula shaped, and
almost exclusively basal. Stolons 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 30,
1/2-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 plumed.
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Distribution
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 Meadow
Hawkweed is found primarily in northern Idaho and eastern Washington.
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Control
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No biological control agents are available for meadow hawkweed. Periodical
application of selective herbicides to grass pastures in the early spring
and followed by nitrogen fertilizer can suppress the weed for 2 or more
years.
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© 1999 University of Idaho:
Text and photographs for these pages from Idaho's Noxious Weeds, by
Robert H. Callihan and Timothy W. Miller (revised by Don W. Morishita
and Larry W. Lass).
Please contact: Ag Publishing, University of Idaho, Moscow,
Idaho 83844-2240; 208 882-7982 visit the Resources for Idaho website at
http://info.ag.uidaho.edu, for more information about this or other
publications.
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