This plant is listed on the North Dakota invasive/troublesome list and this information is being distributed in a guide developed by the ...Read MoreND Weed Control Association and other agencies.
Plant Features
Biennial or short-lived perennial, up to 2 feet tall
One or more stems grow out of a basal rosette
Flower bracts spiny (crab-like), stiff, sharp, light to brown colored
Flowers white to rose, sometimes purple
Blooms from July through August
Small stiff hairs give plants a grayish look
Leaves divided into many segments
Long taproot
Plant breaks at ground level and blows with the wind.
Spreads by seed only
Distribution
Documented in a few areas mostly along roadsides.
Grows under most conditions
Interesting Facts
Suppresses growth of other plants by releasing a toxin (allelopathic)
More highly branched than spotted knapweed
Irritates skin
Widespread invasive in western U.S.
This plant is listed on the North Dakota invasive/troublesome list and this information is being distributed in a guide developed by the ...Read More