So, coffeebean, are they not edging at all between your metal edging and the grass? We had rocks (the small brown kind) and metal edging, and our lawn maintenance people edged it all. I can't remember if it was totally vertical, but it was edged. Wayne Buckley at The Cutting Edge.
thecuttingedgelawn@hotmail.com. He's a little difficult to get ahold of. Email is best.