Posted: 28/10/2013 at 14:35
Correct me if I've got this wrong! Do you mean there's a little 'ditch' between the grass and what has been a border? If so, then I'd say yes you could just fill in with soil and sow grass seed (if it's just a narrow strip) or you could make that part of the border so that it increases your planting area - assuming you want a planting area of course! I'd be inclined to weed all the 'border' first though, get it tidy, draw the soil there right across the ditch and level it out before adding new soil/compost to build up the whole border again. Does that make sense?
If you can post a pic it would help too.