Japanese knotweed
イタドリは侵略的な植物です。イタドリは庭にイタドリの芽が生えていたら、直ちに抜いて取り除きましょう。大きくなってしまうと深く広く根付いてしまうので駆除が困難になります。悪夢です。
Japanese Knotweed is an invasive plant. If you see Japanese Knotweed shoots in your garden, weed them out immediately. Once they grow up, you can hardly remove them. The knotweed can establish deep and extensive root systems that make removal very challenging, bringing you a nightmare.

