I started with a number of round wooden craft sticks, about 1/8" in diameter. They seemed to actually be real bamboo, not that it makes a difference on a scale miniature.
At first, I placed the stick in the chuck for a hand drill and then held a small file against the "bamboo" while turning it. This created the segmented nodes on the stem. Having three hands would have helped in this process. If one has a drill press (second photo below), there is less chance of breakage and the notches are better defined, but it is a slower process to change out.
The notched bamboo was painted light green with craft paint. Next, foliage from an aquarium plant was glued to the top and sides. I detailed the cane with a black wash to highlight the segments, then some drybrush highlighting.
The bamboo was attached to a CD base with Miliput putty, and then covered with a glue/paint/ballast mixture.
With a couple of these on the table, the terrain is evocative of so many settings in samurai and wuxia films. Maybe on my next piece, I'll figure out a way to let my models do this: