I plan to use some small boulders as a border to help keep out predators but I also want something green / pretty to soften the look. I should be able to get away with a few tougher plants as my 4 chickens make a bee line for my vegetable garden when I let them out to free range each evening and usually do not scratch too much around the coop itself. (There is dirt around the coop now as we just finished building it last summer.) The girls walk through my Black Eyed Susans and Daisies without doing too much damage so these may be a possibility. Any other ideas? We live in zone 6 in south central PA. Pictures would be much apreciated!