[Topscaff]

I had knot weed a few years back so I barriered it off chopped it down and burnt it, then I put chickens in the area, three years later I moved the chickens to another area and the knot weed didn't return not sure why, I put it down to lack of light as the chickens kept it down, Mike

[Ice]

I'm another fan of Resolva24h for getting rid of bindweed.  My imported topsoil was full of it year one.  Year two I had 50% less and year three about 10% remains.  As others have said, I also let it put on a few leaves and zap it.  I then leave it in place for a few weeks to see if grows back and any hint of life is zapped again.  Werks fer me.

[Yorkie]

Why are you not allowed to grow anything on the contaminated land?

I would imagine that the risk of transferring a minute part of the plant's roots is too great - it will lead to the plant growing elsewhere which is not a Good Thing.

[Maxine Groobey]

I'm not allowed to grow on the land so there is no chance of disturbing and spreading the knotweed (I assume anyway)!