Turfgrass and Landscape Weed ID
Japanese knotweed
Botanical name: Polygonum cuspidatum
Common family name: Buckwheat or Smartweed
Family name: Polygonaceae
WSSA code: POLCU
US code: REJA2
Notes: Synonym: 'Fallopia japonica'
pollinator

Weed Identification and Control Methods

Stature:
Leaf division:
Leaf margin:
Leaf shape:
Leaf arrangement:
Inflorescence location:
Inflorescence color: White
Tactile: Smooth
Type: Broadleaf
Growth habit: Forb/Herb
Life cycle: Perennial
  • 2-Phenethyl propionate POST
  • Cinnamon POST
  • Cinnamon oil POST
  • Citric acid POST
  • Citric acid, malic acid, and clove oil POST
  • Cloves and clove oil POST
  • Corn gluten meal PRE
  • Eugenol POST
  • Lemongrass oil POST
 
 
Always follow the control method's label directions. In New York, find the latest label information at the New York Department of Environmental Conservation’s Bureau of Pest Management - Information Portal.