NOTE: I have updated this 2015 post in order to make it appear closer to the other mason bee information.
You will find many articles on the internet about the invasive species of Phragmites but the one that grows here on Vancouver Island is the Native species, Phragmites australis (Cav.) Trin. ex Steud. subsp. americanus.
The following article on the Metchosin Coastal website describes an example of misidentification of this species in British Columbia. titled:
http://metchosinmarine.ca/gf/a-new-lease-on-life/