The ability of knotweeds to successfully spread by clonal fragmentation is apparent in some river systems that have extensive infestations of only one genotype. Examples include Big Creek (Oregon) with a single clone of giant knotweed, the Little Nestucca River (Oregon) with only the common female Japanese knotweed clone, and the Samish River (Washington) which was infested with a single male clone of Bohemian knotweed (Gaskin et al. 2014). 

The Bohemian clone of the Samish River also dominates several other river systems in the Northwest, and was by far the most common genotype, representing 69% of all Bohemian knotweed sampled and 55% of all knotweed plants sampled throughout the Pacific Northwest (Gaskin et al. 2014).—United States Department of Agriculture

PLB

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