Ask a Question forum: Japanese knotweed...how to kill

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(Zone 6a)
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UrbanWild
Sep 13, 2016 5:59 AM CST
Japanese knotweed seems who just laugh off roundup. Is there anything that will kill this? We have this in a no-man's strip between a neighbor and I. It is hard to access the area.
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Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Sep 13, 2016 6:13 AM CST
Can you access the area enough to do a cut-stump treatment? That and some other suggestions are in a table at the bottom of this article:

http://www2.ca.uky.edu/forestryextension/KWM/japaneseknotwee...
Name: Elena
NYC (Zone 7a)
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bxncbx
Sep 14, 2016 5:49 PM CST
I have had an ongoing fight against Japanese knotweed ever since my neighbor planted some as a screen. My best advice is to use Groundclear. It will most likely take several applications but it is the only thing I've found to knock it back significantly. You won't be able to plant anything there for at least a year after the last application but it sounds like that won't be an issue for you. Good luck!
Name: Donna King
Selmer, TN (Southern West TN) (Zone 7b)
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donnabking
Sep 14, 2016 6:24 PM CST
What is a Japanese knotweed, & what does it look like??? I never heard of it, and yet we may be eat up with it and just don't know what it is, lil
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Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
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greene
Sep 14, 2016 6:33 PM CST
I remembered there had been a discussion about this earlier; you may get some good ideas about how to eradicate is here:
The thread "Japanese Knot Weed" in All Things Gardening forum
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"

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