I need some input on laying out a perennial polyculture for our farm. some background...... my wife and i were able to pick up 43 acres in gadsden, sc (usa) for a steal about a year ago. it had recently be mostly clear cut, and is currently coming back in sweetgums, oaks, pines, black tupelo, blackberries and such. this land is near congaree swamp for those familiar to central, sc and has a much more rich topsoil than most of sc but does have clay subsoil. what we're trying to do is combine holistic management and ecological design into a workable small farm that is truly sustainable. in our model, we only plan to harvest the best fruits for sale and leave the rest for our own use or the natural environment. it is more important to use to reduce or eliminate the need for human intervention and reduce our labor input (once established) than to make a bunch of money. we just want to be able to live off our land. being that this will be a for profit farm we want to focus on some specific easily grown perennial cash crops (pawpaws, blackberries, blueberries, persimmons, pomegranates, muscadines, pecans, etc) , but we want to work these into a "food forest" type design scheme. we also want to retain what natural forest that is untouched and work with it where possible.my original plan was to roughly design 4 base keyhole type gardens (north, south, east, and west facing) and work them into the larger plan, modifying them slightly for variations in direction and microclimate. this idea will probably work, but it seems to lack the scale needed for a farm sized operation. i think i can overcome the obvious harvesting problem (ie having individual crops spread out everywhere in different "gardens") with careful mapping. atleast then ill know where everything is supposed to be come harvest time. The bigger design problem is that keyholes seem to be geared for smaller applications. for my scale, even linking multiple keyholes into one "garden" seems to small. heres how i see it in my head so far...... i need a single lane road through my "food forest" that can accommodate a small pickup or gator, with smaller paths wide enough to accommodate a wheeled cart. smaller foot paths inside the "garden" could access individual plants. the problem i cant wrap my head around is the overall design of the garden. multiple keyholes in a mandala seem geared more to home gardens, and would IMO lack efficiency in harvest. also, for our application, the gardens need to be a larger scale to accommodate more individuals of any given species. i hope this sort of makes sense. this venture will occupy about 20 acres, and not all "gardens" will be cash crops. i guess what i need the most help with is an overall layout that will work with the for profit farm model....... any ideas?