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Reynoutria japonica (Fallopia japonica, Polygonum cuspidatum)

LHPrism Status 
Tier 3 - Established

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

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