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Old 05-11-2009, 05:07 PM   #1
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Default Polygonum cuspidatum - Japanese Knotweed in Montreal

Someone, years before I moved here, planted Japanese knotweed among the wonderful mulberry and gooseberry bushes. I've got shoots 20 feet away from the main plant, even in the garden, where I dug down several feet before planting this year to try and ensure I got the roots.

What's the right way to kill this menacing invader - without sacrificing the mulberry, gooseberry and currents is grows with?
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Old 05-11-2009, 05:56 PM   #2
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this stuff is nasty!
In the past, I did a lot of digging - it's backbreaking work.
what I currently do (lazy gardeners method) is cut as much green off w/o disturbing the roots.
This seems to help a bit, but not as much as digging or applying herbicide at the right time of year.
If you don't have masses of the stuff, it would be very easy to apply just to the offending plants. cut and paint the stems. I've read some folks inject them in summer.

this link is from Pa in U.S.
http://www.pa.nrcs.usda.gov/programs...CU.4.27.07.pdf

Quote:
A late summer application of the herbicide glyphosate is
one of the most effective treatments available. Late in the
growing season is when the knotweed canopy is sending
sugars from photosynthesis to the rhizomes for storage.
Glyphosate moves through the plant into the rhizomes with
these sugars. It also has the advantage of having no soil
activity. This reduces the risk of injury to non-target plants
through root absorption, particularly in riparian forest buffer
plantings. If glyphosate contacts the foliage of non-target
plants, they will be injured or killed.permit from the PA Fish and Boat Commission. Using an
aquatic-labeled product close to water simply reduces the risk
to non-target aquatic organisms.
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Last edited by bubbleoffplumb; 05-11-2009 at 06:00 PM. Reason: adding quote
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Old 05-11-2009, 11:00 PM   #3
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Drum roll please...

The glove of death. Works every time.
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Old 10-31-2009, 02:14 AM   #4
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A photo for identifying the invasive species Japanese Knotweed
Polygonum cuspidatum - Japanese Knotweed in Montreal-dscf8597.jpg
in full bloom
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Old 10-31-2009, 06:23 AM   #5
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Another thread on Polygonum cuspidatum and an ID photo here:

http://www.wildlifegardeners.org/for...-knotweed.html
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Old 10-31-2009, 09:03 AM   #6
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I noticed that. You have a nice photo I.D. in there.
This one was lacking, so I posted a photo where needed.
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Old 10-31-2009, 11:09 AM   #7
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Yours is so helpful, havalotta, because it shows the plant in bloom. Since people who plant it intentionally often plant it for its flowers, this is a critical ID characteristic.
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Old 10-31-2009, 11:40 AM   #8
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I saw it growing at a nearby camp. I thought it was soooo pretty.
I took a photo of it. I had to have one!
Now that I know it is so invasive it is off my want list!
Did you want this photo over there as well?
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Old 10-31-2009, 11:42 AM   #9
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Gosh, I guess it could only help. Thank you havalotta!
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Old 10-31-2009, 11:44 AM   #10
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Not infringing upon your entry?
It is for learning purpose.
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