I am no expert, but I am not sure you have time to do this yet this fall unless you do it right now. Products like Roundup work best if the grass (or weeds) are in active growth. Here I know by late September the grass is not really growing much, so that would only give it a few weeks to work but even then it might not work as effectively as, say, mid summer when the grass is really growing active. So, maybe you'll have to do the treatment twice?

Can't think of any other treatments, though perhaps you could cover the area in cardboard or something for this fall and a bit of next spring to again smother the grass?

Glen

Thank you Glen. I'll try the Roundup. I'll have to wait for a while for the grass to reappear, though. I already have removed the plants I want to save and will plant them elsewhere for the winter. I have a beautiful very established daphne that I may lose in the process because daphnes don't like to be moved, but I have no choice here.

Suzanne