257 Main Street, Tilton, NH 03276
|, Tilton, NH 03276|
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Information About InvasivES
NH Law -
Fact Sheets from NH Department of Agriculture
Prohibited species - https://www.agriculture.nh.gov/publications-forms/documents/prohibited-invasive-species.pdf
Alternatives - https://extension.unh.edu/resource/alternatives-invasive-landscape-plants-fact-sheet
TCC-Suggested Links to
- trees, shrubs and vines
EDDmapS - https://www.eddmaps.org/
EDDmapS Pro - https://apps.bugwood.org/apps/eddmaps-pro/
Outsmart Invasive Species https://apps.bugwood.org/apps/outsmart/
Japanese Knotweed - Invasive Species
(sometimes called bamboo - it isn't)
According to UNH Cooperative Extension, Japanese
Knotweed (Reynoutria japonica) is an extremely fast growing invasive
herbaceous plant in the buckwheat family. Native to Asia, it was introduced to the United States sometime during the late 1880's as an
ornamental plant. Unfortunately, it crowds out native species and can grow at a rate of up to 8 centimeters ( 3.15 inches) a day in the
spring. It's found in every state except North Dakota, Nevada, Arizona, New Mexico, Texas, Florida, and Hawaii.
Many people mistake
Japanese knotweed for bamboo, but, unlike bamboo, the plant has large,
semi-triangular leaves that alternate
on the stem. It can grow through asphaltand concrete, and reach heights of nine feet. Its woody rhizomes can grow up to 10 feet deep
and 40 feet long. It can remain dormant for years. It can also regenerate fromrhizome pieces as small as half an inch. This makes
it difficult to eradicate. Small populations can be controlled by continually cutting the canes and digging up the roots.
All cuttings should
be allowed to dry in the sun before disposal. It should NEVER be composted.
Knotweed should not be mowed,
as mowing can result in spread. Under the right conditions, mowed or cut stem fragments can root at the nodes.
Smothering is another alternative, but involves using heavy duty (7-mil) black plastic or weed fabric for a 3-5 year period.
the active ingredient glyphosate (Roundup) can kill Japanese knotweed, but it
may take 3-5 years
of repeated applications to eradicate it. Glyphosate is best applied just after flowering until frost.