We are putting in a mulch bed border around our ~350 linear foot fence in the back yard, and I'm looking into edging options. I don't hate the look of mulch going right up to the grass line, but I want to control grass moving into the mulch bed, and I also don't want to create a mess when I mow right up against the beds. For those of you who have mulch beds anywhere in your yard, how do you control 1) grass moving in, 2) mulch spray when mowing on the edge, and/or 3) what edge do you use? I initially looked into brick/stone, since that would allow me to set one of the mower wheels on the brick and mow the edge of the grass cleanly, but at 350 feet, that could get expensive. To the extent it helps, our beds will be almost perfect straight lines, so we don't have to worry about curving products...at least not yet, I'll tackle the front yard another time.