An invasive species of knotweed has been identified by the Whaletown Creek, and will be investigated by the Cortes Streamkeepers, FOCI, and the regional district.
It is of the utmost importance that the area with the knotweed not be disturbed in anyway, until there is professional support & advice on the best approach to eradication. Knotweed can be easily spread with the best of intentions and the wrong approach. The attached photo shows the flowering phase which is just finishing.
Please contact Cortes Streamkeepers (Cec, Christine Robinson -6428) if anyone suspects they know of another location on Cortes with knotweed.
The following is a summary of knotweed species taken from the BC ‘Invasive Species Committee’ website, but for further specific information, please read more at: http://www.coastalisc.com
"Invasive Knotweeds: Japanese, Giant, Bohemian & Himalayan (Fallopia japonica, Fallopia sachalinensis, Fallopia x bohemica & Polygonum polystachum)
Knotweed Species are found throughout communities on Vancouver Island, the Gulf Islands and the Sunshine Coast.
These non-native, invasive species are listed by the World Conservation Union as one of the world's worst invasive species.
The invasive root system and strong growth can damage concrete foundations, buildings, septic systems, roads, paving, retaining walls and the environment.
Knotweed can easily take hold in riparian ecosystems, roadsides and waste places. It forms thick, dense colonies that completely crowd out all other plants. The success of the species has been partially attributed to its tolerance of a very wide range of soil types, pH and salinity. Its rhizomes can extend 7 metres (23 ft) horizontally and 3 metres (9.8 ft) deep, making removal by excavation extremely difficult. Additionally even tiny root fragments can regrow into new plants.The plant is also resilient to cutting, vigorously resprouting from the roots."