Page author: David Giblin
Fallopia sachalinensis
giant knotweed

Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east to Idaho and Montana, also in eastern North America.

Habitat: Riparian zones, roadsides, meadows, ditches, and other disturbed areas generally at low elevations.

Flowers: July-September

Origin: Introduced from eastern Asia

Conservation Status: Not of concern


[none provided]

Accepted Name:
Fallopia sachalinensis (F. Schmidt) Ronse Decr.
Publication: Bot. J. Linn. Soc. 98: 369. 1988.

Synonyms & Misapplications:
Polygonum sachalinense F. Schmidt [HC]
Additional Resources:

PNW Herbaria: Specimen records of Fallopia sachalinensis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Fallopia sachalinensis checklist entry.

E-Flora BC: Fallopia sachalinensis atlas page.

CalPhotos: Fallopia sachalinensis photos.

USDA Plants: Fallopia sachalinensis information.

8 photographs:
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