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

Tooele County Road Department


 

Spotted Knapweed
(Centaurea maculosa Lam.)


Growth Habit:
Biennial or short lived perennial, up to 3 feet tall. Rosette formed first year, flowering stalk elongates second year.

Leaves:
Long and divided below, short and narrow above. Covered with fine hair.

Stems:
Erect with slender wiry branches. Covered with fine hair.

Flowers:
Seed heads mostly on branch tips, solitary, to 1" diameter. Pink to purple, rarely white. Seed head bracts are black tipped, with 5 to 7 pairs of short feathery appendages.

Roots:
Taproot not well developed.

Seeds:
Brownish, 1/8" long, notched on one side of base, short tuft of bristles at tip end.

Other:
Very aggressive, can infest large areas quickly, offers very little big game or livestock forage value.
Quackgrass

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