Fallopia ×bohemica

Fallopia_xbohemica_Bohemian knotweed_John Bailey_cropped
Photo: John Bailey

Common names: Bohemian knotweed

Fallopia ×bohemica (Bohemian knotweed (Japanese x Giant knotweed) is a perennial (family Polygonaceae) with white flowers and broad leaves found in northwestern California. It is native to Japan. It favors grasslands and riparian and bottomland habitat. It spreads via rhizomes and seeds and is dispersed along watercourses and in garden waste.

Cal-IPC Rating: Watch

CDFA Rating: A?


Plant Risk Assessment - An evaluation of the potential for a plant to be invasive in California.

Weed Management Notes

  • Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.

Cal-IPC Newsletter Articles

There are no newsletter articles associated with this species yet.

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

Other Fallopia ×bohemica Information

  • Calflora - Distribution map and records of this species in California.
  • EDDMapS - Distribution of this species in North America.
  • USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.