Invasive SpeciesJapanese knotweed

Fallopia japonica
FOUND by kjurdak
ID Confirmed
Quality checked by kjurdak
Peer reviewed by mstafford
Field Notes
The temperature at 6:00pm is cooler than earlier today. We heard kids voices, traffic and birds. We noticed a sign that read: Caution: Poison Ivy! We used the quadrat vertically rather than horizontally on the ground.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
Leaves are large, 12 -14 cm long and 7 cm wide. Leaves are arranged in alternate pattern on a zig zag stem.
Photo of my evidence.
Leaves are simple, with smooth edges. They are oval with some that look heart-shaped. We noticed that something seemed to being enjoying this leaf.
Photo of my evidence.
This bushy plant has reddish stems with swollen joints where the leaves emerge. The plant is approximately 60 cm tall.
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: 
Less than 1/4 covered
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 44.539250 °
W -69.629410 °
Observation Site Information
A photo of our study site.
Upland - Developed areas
Trip Information
Fort Halifax Park
Trip date: 
Thu, 2010-07-15 18:00
Town or city: 
Type of investigation: 
Species and Habitat Survey
Lower Kennebec
Habitat Observations
Species diversity: 
10 different species
Evidence of vectors: 
Walking trail
Tree canopy cover: 
Between 1/2 and 3/4
Soil moisture: 


What is eating these leaves? Those grazing scars are not something I see frequently. Wow, if this is a place that is convenient for you to get back to frequently, it would be great to see if you could identify the grazing organism!
This looks like a pretty small plant. Were there other stands of F. japonica nearby? Or was it all alone?
Nice work.