Knotweed is a twat of a weed
It needs spraying when 1m tall with water based herbicide such as glyphosate and spray the leaf
Repeat at least 2 more times
Over the winter it dies back and I recommend rock salt on the surface you will be surprised what that kills off
You should spray each time it as foliage but this can take at least 5 years
Thanks Thaksin for the information.
The heads up is that I have reported this to the housing association and it appeared to fall on deaf ears.
She suggested because it was on the river bank it would be the resonsibility of the rivers authority.
Maybe the case but It's now on file and if us pensioner typos should fall beneath a plant damaged condiminium there will be hell to play .
It's quite a pretty plant and that is the reason I guess it was imported on mass from Japan.
If the housing association does not act I will wait until winterfell and then chop down the cane stems.
I will then treat with rock salt like you suggest and spray every month with Glyphosate and we will eradicate this menace together.
I will update again in January to help others who have have been plagued by this weed.
I now have definitive confirmation that this is what it purports to be and thanks to Gabriel Tcib and many others for their kind assistance.
I was suffering last night from severe ethanol poisining but was not about to let a plant dictate the anti.
So I read that in order to defeat an enemy you must first know your enemy inside out.
There is a drop of eight foot into rushing torrents and although I could have been swept away I gathered a sprinliking of courage and some accompaning hero music and entered the belly of this beast.I had to know for sure what we were dealing with.
Call it madness or raw courage but just sometimes in life a man has to draw lines in the sand and stand up and be counted.
Here is the inside of Japanese Knotty weed.
I am not advocating you enter into it's belly the same as me because I am ex military and highly trained for the unexpected.
If you think you have it then for goodness sake seek help and stay calm ehh !