Japanese Knotweed Chanty Mapfumo, Brian Sibrian Hernandez, Seth Pickett

How did it get here? The Japanese Knotweed arrived in the late 1800‘s. It was used mostly for decoration. It spread all over the U.S. and Canada.

How bad is the current situation? In areas like Texas and California people are still finding ways to get rid of it. It’s a problem in people’s gardens because it’s not only on one place it spreads all over. It’s in many others.

Affect on the ecosystem including Natives? Damage to flood defense structures. Reduction in land values. Expensive to treat. Aesthetically displeasing Damages to paving and tarmac areas.

Future Complications? Kills native plants Spreads too rapidly Take over swamp and river areas.

Previous control and/or eradication efforts. Scientists advise that you dig up everything including the roots. Dispose of them properly. Bag fruit and roots in a tight back and throw away.

Map of invasion. The red is where the Japanese knotweed is invasive in Oregon.