Answer: As you have discovered, any roots remaining in the soil have the potential to grow into a new bamboo plant. While vegetation killers such as Round Up and Brush B Gone can kill the tops and the roots of plants to which it is applied, there will always be roots without tops, just waiting underground for a chance to pop up. You can dig every last root out or you can diligently cut off every sprout you see, before they produce leaves. If you do this you will eventually starve the roots (no leaves, no photosynthesis) and you'll be rid of the bamboo. Wish there were an easier solution!
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