favicon Wildflower Identification Website.        Search for wildflowers by location, color, shape and time.       Click here for Instructions.       Login
Search Results
Fallopia japonica
Japanese knotweed Smartweed-Buckwheat Family
Fallopia japonica Polygonaceae
common name
  Japanese knotweed
accepted scientific name
  Fallopia japonica (Houtt.) Ronse Decr.
rules for finding collection records
  Fallopia japonica (470)
  Pleuropterus zuccarinii (0)
  Polygonum cuspidatum (1088)
  Reynoutria japonica (147)
family name
Image Author: ©2007 "MdE"
Image License: CC BY-SA
Image Source
Category: Woody Vines
Flowers: Five petals
Petal colors: color color
Flower size is about 0.33 inches
Leaf: Alternate
Plant Observed 3rd week of April thru end of October
Not Native. Invasive in VT. Noxious weed in MT, OR.

How Likely at this Location (41%)
Name Match (100%)
Plant Showiness (45%)
base map where plant found
mag select

grid lines base