While sheet mulching an acre is a hefty project, consider mini sheet mulching:
In smaller sections of my property I have just been mulching the grass with cardboard and woodchips and then planting trees, shrubs and other plants. This has worked great but it is impractical for the larger forest garden.
When you have exhausted all possibilities, remember this: you haven't - Edison. Tiny ad:
It's like binging on 7 seasons of your favorite netflix permaculture showhttp://permaculture-design-course.com/