Reynoutria japonica

Photo Credit: 
Leslie J. Mehrhoff
University of Conn.
Bugwood.org

Japanese knotweed is a dense growing shrub reaching heights of 10 ft. (3 m). The semi-woody stem is hollow with enlarged nodes. This weed invades disturbed areas such as roadsides and stream banks. Reproduction occurs is mainly vegetative; any stem fragment that contains a node can start a new plant. The dense patches shade and displace other plant life and are exceptionally hard to eradicate. Japanese knotweed is prohibited in New York; it is illegal to purchase, sell, transport or propagate.

Plant Information

Common Name(s): 
Japanese knotweed
Alternate Scientific Names: 
Fallopia japonica
Type: 
Non-Native
Shrubs, Trees
Invasive Level: 
Level 1
Moisture: 
Dry
Moist
Wet
Light: 
Sun
Part Sun
Part Shade
Can be weedy

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