Answer: As I'm sure you know, this plant is terribly difficult to control, particularly since it can spread by seed as well as underground. Apart from concrete barriers, smothering, repeated digging and glyphosate, there is unfortunately no magic bullet that I am aware of. (Although flaming with a propane torch can seem awfully appropriate, it doesn't work much better than repeated pulling.) Eventually, timely control should exhaust most of the plants and keep it to a tolerable level. I'm sorry.
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