Yes, I have grown buckwheat and tried to grow barley but the chickens ran out and ate all the seed in an hour!

Hulling buckwheat is not my favorite sport. The chickens did not like my seed oats but something else did. Millet grows wild in some places and is very harvestable. I generally just reseeded that but it would be a great overwinter chicken feed. Ground it makes a good muffin if you mix it with something else.
I used to take my kids around and saw wild grocery stores along the country roads everywhere but if tshtf, there are so many people now, I don't think we could survive on what is palatable with the competition.
Must say, the cattails this week were great but are mostly over with the heat. Other parts are edible, in a pinch, but we took what we liked.
At this age, not sure I would make it starting with nothing but my knives and cheating with my fire starter. But I have taught my youngest what I know and she now teaches me.
Without laptops and tv and phones, there would be plenty of spare time to plan and get things done.