Its in The Oxbow! Darn! It’s a noxious weed, an invasive species that has no right to be here.
This plant is extremely difficult to eradicate and it’s taken a foothold all around the Oxbow, even onto private property. It spreads primarily by seed (transported by wind, water, animals, humans, or as a soil contaminant), stem fragments, and by shoots sprouting from its system of rhizomes.
PREVENTION & CONTROL
As with most invasive plants, Japanese knotweed can quickly inhabit disturbed ecosystems. One of the best ways to prevent its colonization is to ensure that disturbed habitats are rehabilitated with native vegetation before knotweed can invade.
Single young plants can be pulled by hand depending on soil conditions and root development. If all of the root system isn’t removed, re-sprouting can occur. For small initial populations beyond single plants, or in environmentally sensitive areas where herbicides cannot be used, grubbing with a pulaski or similar tool to remove all of the roots after cutting back the standing vegetation can be an effective control measure. All parts of the removed plants should be bagged and disposed of in a secure location. It is best if knotweed not be mown or cut with weed trimmers as the pieces of the plant can easily get moved around and re-sprout, spreading, rather than controlling the plant.
Chemical controls for Japanese knotweed include application of glyphosate and triclopyr herbicides to freshly cut stems or to foliage. Before using chemicals to control any invasive plant, check with your local environmental or natural resources management agency or Cooperative Extension office to find out what chemicals are legal for use on knotweed in your area.
If you have Japanese Knotweed on your land, please visit this page.