I have a fight going on.....cutting is not advised partly because 1 gramme of green stem can produce a new plant!!.....
digging out is almost impossible for the same reason as any piece of root left with produce a new plant...and i heard the roots can go down up to 6ft or more!!!!.
Also, if you dig up soil or dig out jap knotweed you are legally obliged to have the soil taken away as contaminated waste!!...
I was going to try and catch mine at the baby stage this year and spray it with herbicide but got bogged down with my degree and its already over head height and spreading more than it was last year.
The accepted but very time consuming method ( and may take 3 years or more) is stem injection!!...yep...each stem is injected with herbicide that then goes down the tube and starts killing the roots.
I may try a simpler method of choping the stems off above ground...and pouring herbicide down the holes...this way you can tell which ones you have done and which you havent ( can you imaging how you would know with injecting?) and then i would safely contain all the cut stems until dry and burn them....
Its worrying as it can break through concrete and destroy house foundations and ours is right up to the drive/wooden garage lean too of the house...its also on NATIONAL TRUST land who seem very uninterested in getting rid!
edit:...the other way is to eat the lot! ha ha its very edible at the young asparagus size stage and cut off and cooked tastes and works just like rhubarb ! ..cut a piece of raw stem and taste it...rhubarb!
