Calflora
Taxon  Report   10892    
Fallopia sachalinensis  (F. Schmidt Petrop.) Ronse Decr.
Giant knotweed
Fallopia sachalinensis
© Nick Kurzenko
Photos from
CalPhotos / Calflora
Fallopia sachalinensis
© 2013 Domenic Bongio
Fallopia sachalinensis
© 2013 Domenic Bongio
Fallopia sachalinensis, a dicot, is a perennial herb that is not native to California. Cal-IPC rating: Moderate

Interactive Distribution Map


Observation Hotline
(observation details)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations


Bloom Period
Fallopia sachalinensis
© 2017 Redwood Community Action Agency
Family: POLYGONACEAE  
Genus: Fallopia
Communities: escaped cultivar

Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Name Status:
Accepted by JEF

PLANTS accepted name:
Polygonum sachalinense

 Alternate Names:
ICPN: Polygonum sachalinense
ICPN: Reynoutria sachalinensis
More information about  Fallopia sachalinensis
Photos on Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

USDA PLANTS Profile (POSA4)

Search efloras.org (Flora of North America)

website references from Google


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: Jan 19, 2019).