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Yes, and it's also not quite a simple as just "put these seeds in some soil and you'll have food" either. The whole notion is definitely ridiculous.
As an interesting comparison: from 1940 to 1945, Switzerland had the 'Plan Wahlen', also called 'Anbauschlacht', or 'battle for cultivation'(?). It was essentially a plan to increase the percentage of self-sufficiency in Swiss food consumption due to, well, WW2 happening all around the country. The agricultural area was expanded from 183k to 352k hectares, plus another 20k hectares in small areas like gardens and the like. Production was also switched from being more livestock-oriented towards more efficient crops that can be consumed by humans directly.
Results: Grain production for bread doubled, potato production tripled, vegetable production quadrupled. Self-sufficiency went from ~50% in 1940 to 70-80% in 1945, which definitely helped avoid famines for the 4.something million Swiss people plus 300k refugees from other countries.
So, basically it took 5 years and a concerted, strict national effort during a time of war to raise self-sufficiency, and it was still not at 100% (though I suspect purely calorie-wise, they were OK). Good luck with "growing our own food"...
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SwissChap
Also, isn't there quite a significant lead in to be able to grow your own food? I mean, food's presumably going to stop arriving to some degree or other on 1st November.
It's taken most of the summer for me to yield half a dozen plums from the tree in my garden.