In their quest for unusual new varieties that will grow in their own region, generations of plant enthusiasts have taken specimens from across the planet and actively screened for those that will establish the most easily where they live. Then they've done everything in their power to make it happen. As early as 1856, von Siebold & Company of Leiden's sales catalogue noted casually that that Japanese knotweed is "inextirpable" – a feature they apparently viewed as a benefit.
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