P. Rodney Thompson
Director


Address:

 

829 South Coleman
Tooele, UT 84074

Telephone Number:


Main: (435) 843-3204

 

Hours:

7:00 am - 6:00 pm
Monday - Thursday
Except Holidays
Closed Fridays

Weed Control Division - Noxious Weeds


 

Musk Thistle
(Carduus nutans L.)

Growth Habit:
Biennial, or winter annual, erect up to 7 feet tall. Freely branching. Rosette formed 1st year, flowering stem elongates 2nd year.

Leaves:
Dark green with ligh midrib, hairless or both sides, long sharp spines.

Stems:
Hairless.

Flowers:
Solitary, terminal, nodding heads, 1 1/2" to 3" in diameter, deep rose to violet to purple.

Roots:
Fleshy taproot, hollow near ground surface.

Seeds:
Can be in excess of 20,000 per plant with 90% viable. 90% may germinate in first two years. Seeds may germinate after 10 years in soil.

Other:
Reproduce by seed only.
Musk Thistle

Return to Noxious Weed page.

 

 

 

 

 

 

 

 

 

Tooele County | 47 South Main Street | Tooele, UT 84074 | Telephone: (435) 843-3100