Knotweed (unknown species) (Fallopia sp.) on Aug 31, 2008
Originally reported as Giant Knotweed (Fallopia sachalinense)
Submitter has sample
Description of specimen
Tall stand of plants...approximately 10-12 feet tall. Large heart shaped leaves with white flowers. Growing between the edge of the Tualatin River bank and the community gardens. As fast as this has spread, it will take over the community gardens such that they will no longer be usable.
Commentary
Expert Reviewer
Tania Siemens
WISE Program Coordinator (Watershed and Invasive Species Education)
Oregon Sea Grant Extension
Oregon State University
tania.siemens@oregonstate.edu
541-914-0701
Thanks for reporting knotweed. It sounds like the population you reported should be prioritized for control given its proximity to the river and the community gardens. However, knotweed spreads downstream so in most cases it controlled at the watershed scale starting upstream and working downstream, so this population may not be controlled in the near future. I will forward the report to the appropriate person and find out if there is a plan for control. Feel free to contact me with questions.
Please keep on reporting. Early detection of invasive species depends you folks like yourself watching out and reporting suspicious invaders! Thanks for your help!
Tania Siemens
The Nature Conservancy/OSU Sea Grant Extension
Tania.siemens@oregonstate.edu
Tania Siemens
Sept. 16, 2008, 12:08 a.m.
I learned that the City of West Linn Parks Department is currently treating the knotweed population in question. If you have any questions or want more details please contact Ken Worcester, the Parks Director. His number is 503-557-4700.
Thanks again for your report,
Tania
Tania Siemens
Sept. 16, 2008, 6:25 a.m.