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Japanese knotweed is one of the most difficult weeds to eradicate due to its extensive woody root system.  In England it is notorious for caving in basement walls where it was planted as a foundation plant.  At least 15 years ago I discovered a 'nice' patch of Japanese bamboo along the banks of the Skunk River near the old city pool (Figure 1).  It looked like the patch had gotten started when they had put in the new pedestrian bridge over the river, and over time it spread about 100 yards downstream.