Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on Aug 19, 2026

Description of specimen

Submitter does not have a specimen
EDRR Status: Local expert notified

Bamboo-like sections, spade-like leaves, many pollinators in the area. Saw a big wasp that at first looked like a bumble bee but then it started to eat a bee. Plant goes right up to the embankment.

Commentary

None

Remedy

Oregon State University's Solve Pest Problems page has some great information about how to get rid of knotweeds Solve Pest Problems

This is a tricky weed to manage. Consider reaching out to your local Soil & Water Conservation District for technical advice.

Location

Alongside the river, past the entrance that said that it's a protected trout area, there appeared to be Japanese knot weed, as well as Himalayan black berries.

There may have been native black berries in the area as well, as there were some flat along the ground instead of sprawling.

Expert Reviewer

Avatar of Reviewer

Meridith McClure
Upper Willamette Soil and Water Conservation District

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