Thompson Nicola Invasive Plant Management Committee


TNRD Japanese Knotweed Management Strategy

The Thompson-Nicola Invasive Plant Management Committee (TNIPMC) is currently developing a Japanese knotweed strategy to support knotweed management throughout the Thompson Nicola Regional District. The TNIPMC is asking the public to report any Japanese knotweed occurrences to assist in updating the knotweed inventory for the region.

Japanese knotweed is an invasive perennial plant that has been introduced to North America from Asia as an ornamental plant. It is widely spread throughout the coastal regions of BC and several infestations are known within the TNRD. Japanese knotweed can grow up to 3m tall and have small white-green flowers that grow in showy, plume-like, branched clusters along the stem and leaf joints. Hollow stems stand upright and are bamboo-like with reddish-brown speckles.  Japanese knotweed are often found growing next to homes and within ornamental gardens.  It’s highly aggressive root system can extend 20m laterally and 3m deep and can penetrate septic beds, home foundations, retaining walls, asphalt and other critical structures.This plant reproduces by seed and through root and shoot fragments (as small as 1cm). Accordingly, manual removal such as digging and cutting plants is NOT recommended and could make the infestation worse.  Contact a specialist, such as the TNIPMC, prior to managing knotweed infestations to discuss a management and disposal plan.

If you have knotweed on your property, please report it by one of the following ways:

  1. Cell Phone: Report-A-Weed Phone App
  2. Online:  BC Inter-Ministry Invasive Species Working Group 
  3. Phone: 1-888-WEEDSBC

​​Additional Knotweed Resources

Japanese Knotweed: A Guide to Identification and Eradication for Landowners in the TNRD

Knotweed Disposal Rules

About Knotweeds

ISCBC Knotweed Factsheet