I have one area in the garden which has ground elder. I have tried hard to control it, but over the last 25 years it has expanded to take in my main lawn flower bed. On two separate occasions I have dug up the bed and dug deep to take out all the ground elder roots I could find and then replant the bed up again with flowers. I also resorted a few years ago to spraying the weed but nothing has worked and this year it has come back more strongly than ever. Has anyone any solutions?