It's a bit hard to tell from that photo, but it appears to be Arundo donax. Your comment about height also suggests Arundo, Phalaris does not grow that tall.
I have this growing near me and it does not at all resemble cane, it could just be a large phalaris that's had much water and been left unattended? Look at the end of each plant has same grass head as a phalaris almost?
I would have to say that is not Phalaris. My guess is phragmites but you'd need to post more pictures of the plant and rhizome for a better identification.
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