Jay Angler wrote:...I think a big part of the "automatic backyard food pump" is identifying plants that grow so well in your ecosystem, that you can count on them for your basic calories and nutrition pretty much without fail. Paul has plenty of other plants and young fruit trees on his land, both wild and domestic. Those can supplement and diversify his diet as available (like rhubarb which is only a spring crop due to its oxalic acid content). In my area, the natives relied on the ocean for their "food pump" by harvesting the salmon run. They also grew camas bulbs, but also exported/traded many of those. Many areas around the world had at least one "reliable" staple crop that was well adapted to their ecosystem.
If the information I got is right, the staple crop growing here, and harvested since prehistory, was a wild parsnip. When potatoes were 'discovered', and came to Europe, everyone changed to potatoes. I don't understand why parsnips now are a 'forgotten vegetable' (starting to come back since a few years, mostly in the organic food stores). They grow easily, at least at my allotment garden. Better than potatoes, which get blight and colorado bugs.