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Kendall County (IL) Forest Preserve District Canada Thistle (Field Thistle) The non-native (Eurasia) Canada Thistle is common (unfortunately) in our area and is on the Illinois Noxious Weeds List. It is a very invasive weed in pastures, roadsides and cultivated grounds and keeps trying to move in to our natural areas. It is a 1-3' tall perennial, branching occasionally with slightly ridged light green stems and alternate leaves usually about 3-4" long and 2/3" across. The upper stems terminate into one or more flowerheads. Each flowerhead is about ½–¾" across, consisting of numerous disk florets and no ray florets. The corollas of disk florets are pale pink or lavender.
Canada Thistle along Route 71 May 26, 2013
Canada Thistle foliage along Route 71 May 26, 2013
Canada Thistle at Jay Woods Forest Preserve July 12, 2012
Canada Thistle colony at Pickerill/Pigott Forest Preserve August 21, 2015 Click here for more information. Copyright © 2011-2017 by Kendall County Forest Preserve District. All Rights Reserved. |
