Noxious weeds in Gilpin County
Photo courtesy Adams Co. Weed Department
Musk thistle (Carduus nutans)
Quick Facts:
Biennial plant which reproduces only by seed; to successfully manage
musk thistle, prevent seed formation.
Average plant produces 10-20,000 seeds.
Seeds may remain dormant in soil for over 10 years.
Seeds germinate even under relatively dry conditions.
Musk thistle will not tolerate tillage and can be removed easily
by severing its root below ground with a shovel or hoe. Mowing can
effectively reduce seed output if plants are cut when the terminal
head is in the late-flowering stage. Gather and burn mowed debris
to destroy any seed that has developed.
Maintaining pastures and rangeland in good condition is a primary
factor for musk thistle management. To favor pasture and rangeland
grass growth, do not overgraze.
Please note that there are some native
thistles, which are not noxious plants.
Other Links For Further Information:
http://www.ext.colostate.edu/pubs/natres/03102.html
http://www.colostate.edu/Depts/CoopExt/Adams/weed/musk_thistle_id.htm
http://www.colostate.edu/Depts/CoopExt/Adams/weed/msthistle_mgt.htm
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