Reynoutria japonica (Fallopia japonica, Polygonum cuspidatum)

Reynoutria japonica: Japanese knotweed

Plant Identification:

• Growth form: herbaceous perennial dicot that grows 10+ feet tall in dense stands that exclude almost all other vegetation
• Leaf: alternate, about 6 inches long, 3-4 inches wide, broadly oval to somewhat triangular with a tapered tip
• Flowers: tiny green-white flowers
• Fruit: winged on three sides, 2-4 mm

For more information about Japanese knotweed plant identification, please visit:

• GoBotany
• Global Invasive Species Database
• New York Invasive Speices (NYIS)
• Penn State College of Agricultural Sciences
• National Park Services and Fish and Wildlife Service

For more information about Japanese knotweed best management practices, please visit:

• Global Invasive Species Database
• New York Invasive Speices (NYIS)
• Penn State College of Agricultural Sciences
• National Park Services and Fish and Wildlife Service