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Officials warn Japanese knotweed can spread via soil and damage property
Summary
CRISP staff warned that Japanese knotweed reproduces from small rhizome fragments and can damage infrastructure; the presenter recommended early detection, containment and specific disposal steps for small outbreaks.
CRISP described Japanese knotweed as a high-impact invader that reproduces from rhizome fragments and can wash downstream or be spread in moved soil. The presenter said a 0.5-gram rhizome can reproduce another plant and that dense patches on stream banks can worsen erosion and block access.
On disposal and site work, CRISP recommended containment for small excavations (for example, placing material in sealed black plastic and solarizing it before trashing) and suggested contractors document infestations on site plans so treatment or staged works can limit spread. "If you dug it up... you're gonna put it into, like, a black plastic bag and solarize it for 3 weeks, a month, maybe more," the presenter said.
