Himalayan, Giant & Japanese Knotweeds
Perennial shrub
- Creeping rhizomes
Stems
- Hollow, weakly, woody
- 7-10 ft tall
- Swollen at nodes
- Reddish-brown at maturity
Habitat
- Along streams & rivers
- Ditches & ravines
Impacts
- Invades riparian areas
- Create dense colonies that exclude native vegetation
- New plants
can sprout from fragments as small as 1 inch
To learn more about Kitsap County Noxious Weed Program, contact Dana Coggon at (360) 307-4242.



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