Phragmites australis grows all the way up to Northernmost Lapland here, way above the Arctic Circle. Pictured are some Phragmites cane collected from 60 North latitude, or approximately the same climate as Northern Montana has (thanks to the Gulf Stream). Outside diameter of the cane shafts is 8.8 and 9.2 mm (11/32"+), with a wall thickness of around 1.5 mm (1/16"). Haven't been able to straighten these well enough, so I'm looking for straighter stock. These shafts are solid, though.
Tuukka