"The Oikos Tree Crops landscape is, in a sense, complete. There are a plethora of nut trees: pecans, walnuts, hazelnuts, hickories, buckeyes and, of course, oaks. There is just about every fruit or berry tree, shrub, vine or crawling groundcover imaginable: nannyberry, bearberry, buffaloberry, snowberry, thimbleberry, and berry much more! And for every type of tree or bush or vine, numerous varieties. The main food staple that has been missing from the food forest is perennial vegetables.
Besides all the wild edibles that grow as weeds around the property, such as dandelions, clover, plantain, nettles, asparagus, among many others, we are now propagating dozens of other edible plants that can become like weeds, and grow on their own, either as perennials, or by self-seeding. Ken does not follow the general public’s fear of weeds — utilizing and working with nature’s abundant diversity, he has never had one weed take over completely. Even plants such as the autumn olive berry or scotch broom, that have caused so many farmers grief, Ken welcomes and embraces into his plant community, fully knowing that they are filling a specific niche within the ecosystem.
Wild varieties of squashes and melons are growing on their own out in the fields, and will hopefully spread on their own in the coming years. Earth peas with their exploding pods will become a permanent edible legume. Perennial wheat and other grasses with edible seeds will slowly replace the aggressive bindweed. Tubers, such as Jerusalem artichokes, groundnuts, chufa, oca, wild mountain yams and others are all thriving. We even have a wild variety of crabgrass that originates in Russia, and we cultivate the seeds for food. We have dozens of perennial salad greens, quinoa (a close relative of the common weed lamb’s-quarters), rhubarb, and even tomatoes and peppers. All these and many more will add to an ecosystem that feeds us, and allows for conditions in which the rest of the wildlife in the area can co-exist, thriving together with us in harmony."
http://www.motherearthnews.com/sustainable-farming/permaculture-farm-oikos-tree-crops-zw0z11zsto.aspxSounds like an amazing place to visit. As such, I have only ordered tree seedlings from them, but I'm finally on my way to converting my 1.5 acres into something more closely resembling what they have developed at Oikos.