Also called Sakhalin knotweed, オオイタドリ (ooitadori), Горец сахалинский, Гречиха сахалинская, Polygonum sachalinense and Reynoutria sachalinensis.  Part of buckwheat/knotweed  family Polygonaceae.

Native to far eastern 🇷🇺 Russia, and northern 🇯🇵 Japan.  Invasive > in USA+Canada Invasive > report it! Invasive > in Michigan

Learn more about giant knotweed Fallopia sachalinensis

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