Stop the Knot (weed)

Japanese Knotweed (Reynotria japonica) has been identified in Blowing Rock. Together we can slow the spread of this highly invasive plant. 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. 

Often found along roadsides, woodland edges, and stream banks, this plant can thrive in a variety of light conditions and soil moisture. 

What to do

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: cut down to 6-10” high, 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.

Public spaces

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