[Elcie]

Both of my plots were covered with couch grass when I started.  I first 'sliced' the top layer off with a spade and then dug it over with a fork.  Take out major bits, add some manure, dig in and plant.  Some of my raised beds are not great to be honest and I still get the grass showing through, but it is getting better year on year.

[jb]

I've read that drowning it and then watering with the resulting solution will inhibit the growth of other couch. Don't know if this will work but might be worth a try in a test area (as there was no mention if the liquid could also affect other plants   ).