Spread

Japanese knotweed is propagated by seeds and vegetative plant parts (rhizomes, root stocks, runners, and stems) that may be dispersed via water, wind, cultivation, or other human activities. Based on the relatively slow spread of this species in Montana, dispersion by seeds from ornamental plantings appears limited in this state which may be due to the dioecious nature of the plant or the limited growing season in Montana. The occurrence of roadside stands isolated from ornamental plantings suggests the transport of seeds by vehicles traveling through Montana from warmer climates. Avoid moving fill dirt from areas contaminated with Japanese knotweed. When digging plants, remove, sack, and properly dispose of all vegetative parts including trimmed stems.

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Last Modified: 11/14/2007