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Montana Field Guide

Montana Field Guides

Giant Knotweed - Polygonum sachalinense
Other Names:  Fallopia sachalinensis

Noxious Weed: Priority 1B
Non-native Species

Global Rank: GNR
State Rank: SNA
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Part of the Japanese Knotweed Complex
  • Details on Status Ranking and Review
    Giant Knotweed (Polygonum sachalinense) Conservation Status Review
    Review Date =
General Description
We do not yet have descriptive information on this species.  Please try the buttons above to search for information from other sources.

Range Comments
Non-native, most common in North America along the coasts and somewhat inland; increasingly widespread in MT (Kartesz in prep. 2012).


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Citation for data on this website:
Giant Knotweed — Polygonum sachalinense.  Montana Field Guide.  .  Retrieved on , from