Tilling grasses might kill them unless that grass is one of the many invasive species like Bermuda. The only sure way to eliminate these grasses is to dig out each and every bit of root, unless you want to use an environmentally hazardous plant poison that may not work anyway.

I refuse to use any poison. Working for hours everyday removing every little piece, I was not tempted to apply any chemicals. I am almost obsessed with keeping things as organically pure as I can. I know there will be some that I missed that will come back with a vengeance, but they are no match for human persistence.

Jon I feel your pain, I relate, and I'm compassionate. There's nothing worse than bermuda grass.

I've also started an organic battle agains BG with cardboard and mulches, overseeded clover, sawdust.

Cheers for trying to remove it. I did that in one bed last year, and that was the most invaded bed a few weeks later. Which is why I'm trying other strategies this year.

Happy 2015 with no bermuda grass in your garden !

I am so happy to see this subject. And people who refuse to resort to poison.

Every now and then I announce to the family, "I AM GOING TO POISON THE COUCH GRASS!" And each time I feel a little dismayed.

The only thing that I have found kills Couch Grass/Bumuda Grass/Twitch is boiling it. But you have to dig it out to do this and no one here seems to appreciate my cooking, so I have stopped.

My partner reckons that we should try and shade it out by planting lots of plants. I am starting to think this way.