Posted: 02/06/2014 at 10:23
Not easy, unless you can separate the couch and get weedkiller on it, without touching the plants. Otherwise, you have to do what we are doing at present. Grow the plants on in the pots until they are strong and healthy. then take them out of the pots and wash all the compost off the roots. Tease out the couch grass roots and repot the plants. Do this until there is no more couch appearing. Time consuming, but it works, eventually.