Invasive knotweed identification and control - King County Knotweed is distinctive looking but can sometimes be mistaken for other plants Red osier dogwood and young black cottonwood trees are sometimes mistaken for knotweed; however, they are both native and healthy for riparian (habitat along river and streams) ecosystems
Reynoutria japonica - Wikipedia Bohemian knotweed, a hybrid between Japanese and giant knotweed that produces huge quantities of viable seeds, now accounts for about 80 per cent of knotweed infestations in British Columbia
How to Get Rid of Japanese Knotweed - The Spruce There are several approaches to treating Japanese knotweed While you can try natural methods such as smothering, cutting, and digging of smaller and younger plants, you will likely need an herbicide for Japanese knotweed, especially if the plant has become established
Invasives in Your Woodland: Japanese Knotweed (updated 2025) Japanese knotweed (Polygonum cuspidatum or Reynoutria japonica) is an upright, shrubby, herbaceous perennial plant that can grow to over ten feet in height It commonly invades disturbed areas with full or mostly full sunlight, such as roadsides
Japanese Knotweed - Penn State Extension Knotweed honey is a popular monoculture honey, as its fragrant, nectar-rich blossoms are a favorite of our nonnative honey bee (Apis mellifera) In its native Asia, knotweed has many applications in traditional herbal medicine
Invasive Plant Factsheet: Japanese Knotweed Japanese Knotweed is native to Eastern Asia, including China, Japan and Korea It was introduced to the U S as an ornamental in the late 1800s and was initially used for erosion control
Japanese knotweed | Description, Invasive Species, Weed, History . . . Japanese knotweed, (Fallopia japonica), herbaceous perennial plant of the buckwheat family (Polygonaceae) native to China, Korea, and Japan Persistent and aggressive, Japanese knotweed is a noxious weed in many areas outside its native range and ranks among the world’s worst invasive species
Japanese Knotweed | Minnesota Department of Agriculture Knotweed grows quickly and has hollow, bamboo-like stems that form dense leafy thickets Stems are green with reddish nodes, become tough and woody with age, and appear reddish-brown in the winter
Knotweed | solvepest Knotweeds are a group of related, invasive plant species They are shrub-like, broadleaf plants that die back in the winter Knotweed plants grow 4–15 feet tall each year They have large, oval-to-heart-shaped leaves Take action to report and control knotweed