If it's your own bamboo, you need to dig out the main clump and then trace any runners which have spread from it and pull them out too. Most bamboo doesn't send runners very deep so they are comparatively easy to trace. When I removed mine I cut the turf above the line of the runner and then pulled the runner upwards to get an idea of its route, and continued the cut on that basis. You will need to backfill where the runner has been removed with earth or compost (assuming you are working in a lawn as I was). It's time consuming, but I have seen very little evidence of bamboo in my garden over the past couple of years.
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dig it out.
If it's your own bamboo, you need to dig out the main clump and then trace any runners which have spread from it and pull them out too. Most bamboo doesn't send runners very deep so they are comparatively easy to trace. When I removed mine I cut the turf above the line of the runner and then pulled the runner upwards to get an idea of its route, and continued the cut on that basis. You will need to backfill where the runner has been removed with earth or compost (assuming you are working in a lawn as I was). It's time consuming, but I have seen very little evidence of bamboo in my garden over the past couple of years.