The area of yard I intend to sow as lawn is around 150sqm, and has just been levelled by machinery which removed much of the plant material. Most parts of it have just had a shallow layer scraped off the surface though and there is couch (aka twitch) established in perhaps a third of the total area. In the parts where the level had to be raised, I expect some broken couch stems will be mixed in and will sprout.
After initially trying to dig out some of it, I've realised the full extent of it so I'm interested in a larger scale solution. Any tips would be appreciated!
I don't want to spray it with herbicides, so I'm looking for a solution consistent with organic gardening philosophy.