Thanks very much Neil, I agree, so I’m trying not to leave one iota of root, but I know that is a vain hope with Couch. So I am removing the top 8-10 inches completely and carting it off to my pallet-built ‘couch corral’ where I intend to leave it all covered up for a couple of years to see if it will die. Then I’m SIEVING the soil in the next 8-10 inches. I know this destroys the soil structure but I am hoping I can build all that back up again once I’m rid of 99% (?) of the roots. I’d much rather the no-dig solution works so I’m keen to give it my best shot.
We’re fortunate in the free woodchips, so I’ll make sure it’s a good thick layer.