Japanese Knotweed

Knotweeds are a group of closely related invasive plants from Asia.  Knotweeds are very tall plants that can grow to over three meters with bamboo-like hollow stems and heart-shaped or lance-shaped leaves.  They spread quickly and form tall, dense thickets.  They dominate stream banks, sides of roads, gardens, and other sunny, moist, and disturbed sites. 

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