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Over millennia our ancestors died and suffered learning which plants they could eat in tough times and which they couldn’t. The landscape has changed much since then but people have kept important information about edible plants alive. Strangely enough our society seems to be shutting its doors on the prospect of the natural world and all its abundance. We would rather crush it all and build strip malls that sell frozen yogurt. Its just the reality of what we do! Actions speak louder than words.
This is a great article that can offer you up some knowledge on the subject of wild edibles. Of course, knowledge is only one part of the puzzle. If you are going to truly take advantage of this thing you need to get out there and find them, process them, cook them and eat them. Or else, its all for show.