Go Native: grow lots of vegetables as if they were weeds.
(excerpts)

"This gardening topic concerns growing vegetables that are native to you specific micro-environment. Gardeners all around the world begin this process accidentally, as some vegetables they do not pick, mature in the garden, grow old and decompose, leaving seeds behind.

In the Spring of the following year, those seeds come up like crazy, and most gardeners chop them out as they are considered no different than weeds. Those plants are known as "volunteers," as you did not plant them on purpose, but are the freely given offspring from last year's plants. Here is a technique I've employed successfully, to make the most of those volunteers:

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In fact, a rule of nature is that she will do her best to cover up any exposed, open, fertile soil with plants. We are trying to use this rule to our advantage here. If we can keep the weed seeds out of the garden, and keep the vegetable seeds (that we have personally selected) in and throughout the garden, then over the years the garden will grow a lot of vegetables, as if they were weeds. …

. I've done this technique for many years, and now have many types of lettuce, basil, squash, beans, sunflowers, Swiss chard, broccoli, tomatoes, etc., come up where the weeds use to be.

But these vegetables, are just not any old, bad-tasting things, but specific varieties that I have selected and helped along. Again: you have to be vigilant in checking out the individuals you save. Make sure they are robust in growth, taste great, look good, and have no problems with disease or pests.

This is an obvious good survival technique for after the pole shift as you can image having vegetables come up where and when weeds naturally grow. You will find, just as I have, that this technique will put food on the table, many days of the year, without you having to work at it."