This is the most sadistic method. And my personal favorite. It’s pure attrition. Bamboo needs leaves to photosynthesize.
You mow. You mow again. Every single shoot that dares to appear, you chop it down. Relentlessly.
Do this for a whole growing season. The rhizomes run out of gas. They starve. They shrink. You are the grim reaper with a lawnmower. It feels so petty and so good.