I sheet mulched this year's garden because I am putting it where Christmas trees used to be. I don't want to deal with removing the stumps and I know the soil is pretty acidic. I'd like to expand the size of my garden next year. The surrounding area is grass, some brambles, weeds and tree stumps. The stumps make it impossible to till. I have used a polaski to chop away the grass in part of the area but is it possible instead to weed eat everything down and overseed with a nitrogen-fixing cover cross that will compete with the grass? In late winter I am going to turn my chickens out on the whole garden to go to town, eat whatever they want and level it. I also keep my manure pile in that same area so by then it should be composted and I'll be able to fork it out over the garden as they wreck (good) havoc on the cover crop and last year's beds.