8up, When you harvest, be sure it is at least 2nd year growth. First year growth is not mature enough for arrows and will wrinkle when dry. If the paper-like sheath at the nodes has started to deteriorate or is gone all together, then it is OK for arrows. Also the color sometimes changes to more of an olive green, rather than the bright green of the younger shoots. When you cut the canes, look at the thickness of the walls. Thin walls(comparitively speaking) is probably 1st year growth.
Cane, like hardwood shoots, will shrink as it dries so collect canes that are slightly larger than you want your arrows...about 3/8" or slightly larger at the base. Pat