Invasive knotweed rooted in S. Oregon

Comments GRANTS PASS, Ore. (Map, News) – Invasive species have been crowding out native plants for years, but Japanese knotweed is even more insidious than most. “It’s just a nasty, nasty plant,” said Robin Taylor, a U.S. Bureau of Land Management botanist who calls knotweed “her nemesis.” Cutting the plant does more harm than good, she said, because it’s a rhizome with underground stems that can travel 60 feet and be more than 3 feet deep. Cutting only stimulates more growth. “It’s the only species I know that will push out blackberries,” added Mike Cooley, who works…

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