Youtube on Survivalist gardening / Permaculture gardening.
PBS Special - Overview of the Secret Garden of Survival
https://www.youtube.com/watch?v=K4ajde6oT7o
click SurvivalistGardener and you will have a full list of his videos.
If we ever get to the point where gardening and canning become “hoarding crimes against the people” it would be good to have hidden permaculture gardens to fall back on.
(I say this and ere I am stuck in the suburbs!)