Invasive SpeciesJapanese knotweed

Fallopia japonica
FOUND by littleriver28
ID Confirmed
Quality checked by LR
Peer reviewed by LR
Field Notes
The air was chilly and a little windy. I am happy because I think I found Japanese Knotweed. A problem I ran into was placing the quadrat down because there was so much vegetation clouding the ground. What I see are plants, people, a walkway, and the sky. I smell dirt, mud, and coldness. I hear people talking, the wind whistling in the air, and leaves rustling on the ground. Lastly I am surprised that we found so much data because we did not think that there is any Japanese Knotweed near here and right here there is a decent amount of what we think is Japanese Knotweed.
Supporting Evidence
Photo of my evidence.
How I know this is that on the plant that I found has spade shaped leaves that are growing from the plant at an alternate pattern also called opposite pattern. These are both things that are on Japanese Knotweed and according to the vital signs ID card made by barnacle on the Vital Signs website the leaves of Japanese Knotweed are spade shaped.
Photo of my evidence.
My second piece of evidence is that there were whitish colored flowers growing from the plant. These flowers were in bunches that grew off of nodes. Nodes are the branches where the leaves from the plant grows. How I know this is correct is that according to lithiumsulfate's ID card on the Vital Signs website Japanese Knotweed has small white flowers.
Photo of my evidence.
My last piece of evidence is that there were hollow stems. In my photographic evidence it shows a broken branch that we found in our quadrat that has a hollow middle. Hollow stems are signs of Japanese Knotweed, and how I know this is correct is that according to the vital signs ID card made by barnacle, on the Vital Signs website Japanese Knotweed stems are hollow.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Fallopia japonica
Common name:
Japanese knotweed
Count of individuals: 
Between 1/4 and 1/2
Flower (plants)
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.664181 °
W -70.445698 °
Observation Site Information
A photo of our study site.
Upland - Forest
Trip Information
Weeks Road Trail System
Trip date: 
Fri, 2018-10-12 08:00
Town or city: 
Type of investigation: 
Species and Habitat Survey
Habitat Observations
Species diversity: 
2 different species
Evidence of vectors: 
Walking trail
Recent disturbance
Tree canopy cover: 
Open to 1/4 covered
Soil moisture: 
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