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Japanese knotweed is an invasive weed that threatens native plant habitats. More on this topic from Invasive Plant Atlas of New England.

• Family: Buckwheat (Polygonaceae)
• Habitat: roadsides, waste places, streambanks
• Height: 4 to 10 feet
• Flower size: 1/8 inch across
• Flower color: yellowish- or greenish-white
• Flowering time: July to October
• Origin: Asia