Stop the Knot (weed)

Japanese Knotweed (Reynotria japonica) has arrived in Blowing Rock. Large and fast-spreading, this plant can do extensive damage; its roots can break through concrete, it forms a dense canopy and is allelopathic — releasing chemicals which inhibits the growth other plants, creating a dead-zone which can take years to recover even after the plant is removed. 

It can damage buildings, walls, driveways, and sidewalks. Left untended only increases the damage that will be done and the cost of removal. The best strategy is to remove it as quickly as possible.

What to do – Reporting

Use the form below to submit any sightings of Japanese Knotweed in Blowing Rock. The Town of Blowing Rock will address patches found on public land, and can refer property owners to services that can assist with removal on private land.

Property owners

Removing the plant, above and below ground, is the most effective approach. Beware, it can regenerate from small pieces, and its roots can go down several feet down. Only the smallest plants can be removed by digging. The preferred approach is apply herbicide to the area, and monitor for re-growth. Repeat this process throughout the growing season, be prepared to repeat for 2-4 years.

Citizen Science

Participate in our Citizen Science project: Stop the Knot. Make an observation using iNaturalist, and be sure to record the location. The town will treat the area. Visit: inaturalist.org/projects/stop-the-knot