This species is prohibited under Michigan law; forms dense thickets that shade out natives; rhizomes can damage pavement; extremely difficult to eradicate; spread by flood waters.
Hybrid cross between Japanese knotweed (Polygonum cuspidatum) and Giant knotweed (Polygonum sachalinensis).
Hybridizes with Japanese knotweed and silver lace vine (P. baldschuanicum).
This species has been listed as a restricted species under Michigan law; forms dense, impenetrable stands.
This species is listed as a prohibited noxious weed by the Michigan Department of Agriculture; most plants are dioecious and many populations consist of only one sex; in mixed populations, most
plants are male and little seed is produced.
Grows rapidly over native vegetation; wind-dispersed seed travels long distances.
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