Invasive SpeciesJapanese knotweed

Fallopia japonica
FOUND by gmsleech
ID Confirmed
Quality checked by AG
Peer reviewed by
Field Notes
Our location of the Japanese Knotweed (Fallopia Japonica) is in the forest, on the right of a dirt path, and very close to a pond. The trail leads into the woods and is just off of Weeks road in Gorham, Maine (close to Portland, Maine.) The exact location of our site in latitude is 43.6652361 North, and the longitude is -70.4429546 West. Our group was happy because there was a lot of knotweed in our control area so it was easier to count and collect data about it. It is also easier to get good pictures because they are more spaced out. The stems of the Knotweed are so clumped together, you're able to stand under it. The leaves act like a roof. There were some problems we got stuck in. In our treatment area, there were too many different species of plants and it as hard to just remove the knotweed. It takes only 10 weeks for the knotweed to grow 3-4 meters tall. Description: On Thursday the tenth of October at about 8:00 in the morning there was dew on the ground and most animals were asleep. That morning we started pulling out the plant and then digging out the roots of the plant so that we can weigh and treat our plot of Invasive species.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
The stems of the Japanese knotweed look just like bamboo stems, and they are mostly hollow inside. You can eat the stems in the spring when they’re the ripest, most people say that they taste just like rhubarb, or sour apples. Growing off the tip of the stem, are long flowery plants that have a gold-yellow color. Along the stem, there are little black dots.
Photo of my evidence.
The shape of the leaves is oval shaped with a small point at the end. The color of the leaves is orange, yellow, and a darker green. They also alternate on either side of the knotweed stem, which can help you identify the Japanese Knotweed. The leaves are usually clumped together making a little fort. The size of the leaf that we measured was about 7 by 4 inches.
Photo of my evidence.
On this stem of Knotweed, you can see the long flowery-like plants that indicate that is this Japanese Knotweed. The color of the flowers and usually creamy-white. They grow off the stem of the leaf and also act as decoration to the plant. This flowery-plant is about the size of two index fingers and usually arrives in late summer.
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
Flower (plants)
Sampling method: 
Just looking around
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.664086 °
W -70.445486 °
Observation Site Information
A photo of our study site.
Upland - Forest
Trip Information
Gorham Weeks Road Trail
Trip date: 
Mon, 2018-10-08 08:46
Town or city: 
Type of investigation: 
Species and Habitat Survey
Habitat Observations
Species diversity: 
1 different species
Evidence of vectors: 
Walking trail
Tree canopy cover: 
3/4 - Completely covered
Soil moisture: 


Hi gmsleech,

Your coordinates have you a bit far from Gorham. Please leave a comment with the correct coordinates and we can get this observation back on track.

-The VS team-

Great job

I thought that was really good!