Thank you for your observations, Susan.
None of the crops you've listed have anywhere near enough protein or amino acids.
Not enough protein for what purpose?
The scope of what I am trying to accomplish is just to make crops available for backyard cultivation, that otherwise wouldn't be, and that only on a fairly local level, other than perhaps shipments to distant friends. Any more than that is quite beyond my capacity.
Plants that contain complete proteins (all nine essential amino acids) are amaranth, buckwheat, quinoa, hemp, and soy. Or, you'll have to combine some foods to get the complete proteins: legumes + nuts, legumes + seeds, or legumes + grains.
Right. And these are mostly beyond the scope of the average backyard gardener, although I have grown Quinoa in my backyard. Hemp is rather problematic in the USA, though I might grow it elsewhere as the fiber is quite useful, being one of the few really durable natural fibers that can be grown in a temperate climate.
I don't think most people will figure out what to do with Amaranth. You can sneak small amounts of Amaranth flour into baked goods, but by itself it cooks up rather unpleasantly gooey to most palates. And although there are short varieties that will grow in this climate, it is probably better suited to climates that overall are warmer and drier.
Another problem is that most of these crops are not very productive compared to limited growing space and/or the necessity to till the soil by muscle-power. Potatoes are one of the few crops that would produce enough calories to live on. Calories are the limiting factor before protein.
I would expect commodity crops to remain available on the market--or if not, we're in worse trouble than I can deal with. Better eat the potatoes.
Rhubarb is heavy on oxalates.
Right, the leaves, which people don't usually eat, contain Sodium oxalate, which would cause gastrointestinal distress.
The leaf-stems ("petioles") don't, which is why they are safe to eat. They do contain Oxalic Acid. I wonder if you are concerned about the Oxalic Acid binding up calcium? You'd have to eat rather more than you are ever likely to, raw, for that to be a serious concern. I do eat some Sorrel leaves raw, but not enough to be a concern.
My Sorrel, Good King Henry, and Oca (Oxalis tuberosa I think) contain Oxalic acid. So does spinach, although breeding has gotten rid of most of it. Spinach isn't as sour as it used to be.
Survival is not health.
Right. Survival is survival. If the variety of foods available on the market is cut off--which would probably be a temporary matter, for example, due to a banking or currency crisis, ala Russia or Argentina--then I'll take my chances with survival.
Of course one can not grow food fast enough from scratch, starting from seed, say, fast enough not to starve to death. So, it is a prudent precaution to store dry goods, and as a precaution, perhaps some vitamin tablets. One can utilize the complementary proteins that you mentioned, such as rice and lentils.
Then the only problem is securing fresh vegetables to go with our dry goods--hence the backyard garden.
At some point, we reach equilibrium again, though I suspect at a rather more austere standard of living, than what most are used to or emotionally prepared for.
The Irish Potato Famine of the 1800s showed what happens when you depend on one type of crop.
I agree. My backyard produces many more different crops than entire states do on a commercial scale. Backyard gardens are not the source of global monoculture; global plantation operations are.
As for why the Irish were growing so many potatoes--it's because the Lords who owned all the land wanted to devote as little land as possible to feed their de facto subjects. It also didn't help that they had a damp chilly year that year. The disease was Phytophthora infestans which, being natives of the southern hemisphere, potatoes have no natural resistance to, though I have some breeds which have
some resistance.
When I was in Ireland I happened to visit Glasnevin, where the disease was identified--too late.
Allowing annuals to reseed naturally without intervention year after year leads to a serious decline in quality
OK. Not sure what brought that up; I'm not advocating that. And most highly-bred crops won't reseed "naturally" anyway.