The NWIPC's 12 Most Unwanted Weeds
Himalayan balsam
Also known as Policeman's helmut, this pretty but invasive plant earned Marc Schuffert (Ministry of Forests and Range) runner-up status in the 2008 photo contest.
You can view all the photo entries by selecting the "More information" web link below.
More Information: http://www.nwipc.org/documents/all_entries_web_doc.pdf
Photo Credit: Marc Schuffert