Polygonum Cuspidatum Sieb. & Zucc.
- Member of the buckwheat family (Polygonaceae)
- A shrub-like perennial that originated from Asia
- Grows to heights in excess of 10 feet
- Stems are smooth, bamboo-like and stout
- Stems are hollow, but may be water-filled depending upon soil moisture and time of year
- Found in parks, gravel bars, along riverbeds, stream banks, rights-of way, and roadsides. It is also found in riparian areas and will move up river columns.
How It Got Here:
- Originated from Asia and spread west for the last few hundred years (primarily by fragmentation)
- 10mm of plant can re-grow to maturity.
Reasons for Concern:
- Can invade and thrive in a variety of habitats with no natural predators or control mechanisms.
- Knotweed has evolved characteristics that aid the plant in exploiting riparian areas
- Knotweed reproduces through seeds, rhizomes, and sprouting from stem pieces which can move quickly down a riverbed and create new infestations.
- Knotweed can cause reduced land value due to its invasive nature.
- Canes can sprout through 6 inches of concrete or asphalt. (roads & foundations)