I see there is some river cane for sale to make powder measures. What is river cane specifically, or is that just another made up local name? The reason I ask is that there are a number of cane brakes near me and none are on a river. Also you used to be able to buy cane poles for fishing rather cheaply. Why not just use them as a source?
Carpet used to come rolled around large cane poles. I used one of them in Jr. High school to practice pole vaulting at home and won the county grade school pole vaulting event.