Fallopia japonica is native to Japan, Taiwan and Korea. It is now widely
naturalized in Europe and North America, and is regarded as one of the worst
invasive alien species. For Japanese people, F. japonica has been one of the most
familiar and useful wild plants for centuries. It is rare to regard the plant as a
harmful weed in Japan. Fallopia japonica has many ethnobotanical uses as an
edible and medicinal plant. Therefore it was recorded in many historical documents,
by different names. A dictionary of local plant names recorded 689 words
for F. japonica, and it was the plant with the most names among all plants listed.

from: Fallopia japonica (Japanese Knotweed) in Japan: Why Is It Not a Pest for Japanese People? © Springer International Publishing Switzerland 2016

[note: the current accepted name is Reynoutria japonica; it was also called Polygonum cuspidatum]

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