It is said in the [[Nihon Shoki]] that a Tajihi Flower (Itadori Flower) fell into the well where [[Emperor Hanzei]]'s bath water was being drawn from. He henceforth got the name "Emperor Tajihi no Mizuhawake".
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*Scientific Name: ''Fallopia japonica''
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The perennial Itadori flower is found on all four main islands of Japan, along with general East Asia.
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It is said in the [[Nihon Shoki]] that a Tajihi Flower (Itadori Flower) fell into the well where [[Emperor Hanzei|Emperor Hanzei's]] bath water was being drawn from. He henceforth got the name "Emperor Tajihi no Mizuhawake".
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[http://www.t-c-m-rd.co.uk/invasive-weeds/japanese-knotweed Japanese Knotweed]