I live in the Seattle area. My neighbor has a very nice lawn -- it's unnaturally green, other-worldly thick, and chemical-dependent. I'm going to overseed my lawn with a nice mix of microclover, rye and fescue for what I hope is a lawn that doesn't require poisons and a lot of watering to maintain, and that keeps the weeds in check.
My question is: How do i best separate my lawn from hers so that I don't screw up what she's spent a lot of time and money on. Are there lawn barriers that I can hammer into the ground pretty deep?