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‘Fiercest, Most Damaging Invasive Weed’ Spreading in Rivers, Lakes in Japan, Alligator Weed Found in Numerous Locations

Alligator weed

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By Hiroto Nishihara / Yomiuri Shimbun Staff Writer

14:15 JST, December 27, 2025

Alligator weed, an invasive plant species native to South America, is spreading in rivers and lakes in Japan. The aquatic plant is described as one of the fiercest and most damaging invasive species because of its high reproductivity. It is causing damage to agriculture such as by covering rice padd...

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