permaculture is permanent agriculture. You don't till, fertilize, sow and repeat. You have a natural selection of foods typically found locally in the wild and you harvest that. We do it unintentially. We have wild things that grow out of our compost heap to include all kinds of squashes, tomatoes, lettuce, watermelon and this year...corn! We eat what we want and let the rest go to seed and it regenerates the next year. However, most permaculture is about harvesting berries, bark, roots, wild plants that regrow and offer a constant food source. Again, we do this completely by accident as I hate weeding the gardens. I'm getting a deck as my wife has recently taken up foraging exercises with the kids. You'd think there was a zombie apocolypse just around the corner. The guy has a great site and a big following so no surprise his deck is a big hit.