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.