Douglas County Conservation District                                                                         ~Helping People Help the Land~                                                                                                            

by promoting projects through education to further the long- term sustainable   use of natural resources balancing the needs of agriculture and urban growth

                

                                                                            PO Box 688, 7519 E. Hwy 86, Franktown, CO 80116

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Musk Thistle
Carduus nutans

A biennial or sometimes a winter annual, which grows up to 6' tall.  Leaves are dark green with light green midrib, deeply lobed, and spiny margined.  Leaves extend onto the stem, giving a winged appearance.  Seedlings, shown above, have wavy margins and are somewhat lobed with marginal yellow spines.

Flower heads are terminal, solitary, 1 1/2 inches to 3 inches in diameter, and usually bent over.  Sometimes called the nodding thistle.  Flowers are a deep rose, violet or purple, occasionally white.  Fruits are 3/16 inch long, shiny, yellowish-brown with a plume of white hair-like fibers.

It spreads rapidly forming extremely dense stands which crowd out desirable forages.  Chemical control is effective.  The musk thistle weevil, when introduced to the area, feeds on the seeds and can limit the spread of this plant.