How do i kill Japanese Knotweed?
Dr. Green Thumb
How do I kill Japanese Knotweed (Polygonum Cuspidatum) ? I have a rather
large patch behind my garage, I want to kill it so that it don't come back.
Thanks,
Green
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Ann
>Hello,
> How do I kill Japanese Knotweed (Polygonum Cuspidatum) ? I have a rather
>large patch behind my garage, I want to kill it so that it don't come back.
To repost info I gave an earlier inquirer:
According to http://www.nps.gov/plants/alien/fact/pocu1.htm
CURRENT MANAGEMENT APPROACHES: Grubbing is effective for small initial
populations or environmentally sensitive areas where herbicides cannot
be used. Using a pulaski or similar digging tool, remove the entire
plant including all roots and runners. Juvenile plants can be hand
pulled depending on soil conditions and root development. Any
portions of the root system not removed will potentially resprout.
All plant parts (including mature fruit) should be bagged and disposed
of in a trash dumpster to prevent reestablishment.
Cut stem treatment: Use this method in areas where plants are
established within or around non-target plants or where vines have
grown into the canopy. This treatment remains effective at low
temperatures as long as the ground is not frozen. Cut the stem about
2 inches above ground level. Immediately apply a 25% solution of
glyphosate (e.g., Roundup, or use Rodeo if applying in or near wetland
areas) or triclopyr (e.g., Garlon) and water to the cross-section of
the stem. A subsequent foliar application of glyphosate may be
require to control new seedlings and resprouts.
Foliar spray method: Use this method to control large populations. It
may be necessary to precede foliar applications with stump treatments
to reduce the risk of damaging non-target species. Apply a 2%
solution of glyphosate or triclopyr and water to thoroughly wet all
foliage. Do not apply so heavily that herbicide will drip off leaves.
The ideal time to spray is after surrounding vegetation has become
dormant (Oct-Nov) to avoid affecting non-target species. A 0.5%
non-ionic surfactant is recommended in order to penetrate the leaf
cuticle, and ambient air temperature should be above 65 ºF.
--
Ann, Gardening in Zone 6a
Just south of Boston, MA
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