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Japanese Knotweed:
Japanese Knotweed:
Background: Japanese Knotweed are woody perennial plants
that can reach 9 feet tall in height. They grow in large colonies
and have hollow bamboo like stems. The stems die back each
year but reappear around April and can grow around 3 or 4
inches at their peak. Leaves are 4-6 inches in length and width
and the flowers are small greenish white, and appear late
summer.
Spread: Japanese Knotweed came from Japan and was
introduced to the US as an ornamental. The species inhabits
creeks, rivers, wetlands, and railroads. Dense stands of
knotweed lead to little diversity and other plants. In
Pennsylvania, Japanese Knotweed was once planted at many
strip mine remediation sites.
How to stop the Spread: The best way to control Japanese
Knotweed is with an herbicide treatment during the flowering
stage. Two biological controls have proven effective in
preventing the spread as well. After Knotweed has been
removed from an area it is important to plant another native
species so that it does not return.