Source: California Invasive Plant Council

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Polygonum sachalinense (Sakhalin knotweed)

Polygonum sachalinense
Polygonum sachalinense
Photo courtesy Joseph DiTomaso

Polygonum sachalinense (Sakhalin knotweed) is a perennial forb/herb (family Polygonaceae) Plants grow vigorously and create dense colonies that exclude other vegetation. Established colonies are extremely difficult to eradicate. It inhabits disturbed moist sites, roadsides, riparian and wetland areas. Plants typically grow in open, sunny areas on moist soils in cool temperate climates. Very little of this species occurs in California. It is a much bigger problem in the Northwestern US.

Jepson Manual, 2nd Edition: Fallopia sachalinensis

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Polygonum sachalinense

Cal-IPC News Articles

  • Brusati, E. (2005). Japanese knotweed (Polygonum cuspidatum) and other knotweeds. Cal-IPC News. 13: 10.

Cal-IPC Symposium Proceedings

  • Crockett, R. P. and M. L. Krebsbach (2004). The new “JK Injection Tool” for control of knotweeds and other hollow-stem plants growing in sensitive wetland sites. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Tu, M. and J. M. Randall (2003). 2003 Cal-IPC red alert! New invasions, recent expansions, and a few others to be on the look-out For. California Invasive Plant Council Symposium 2003. Kings Beach, CA.

Other Resources on Polygonum sachalinense