I do wish that, under SHTF conditions, more people would realize that the survival garden cannot be like the same as you garden today. This article only touches the issue but it is a start. Though I think that if the correct you carefully select certin old Indian cultivate, corn can be a viable food crop for most areas. The Mandan peoples raised surplus corn to barter with the Plains tribes but never allowed manure of any type near their gardens as it was consided “unclean”.
Tomatoes are not justifiable as a major crop but the smaller, cherry types are much easier to grow than slicers. Tomatoes are just too versatile (and tasty) to do without completely.
Cucumbers are really not justifiable but some older “pickling” might be the best if you must. Preppers: Three Overrated CropsWe need crops that are easy to grow and are packed with nutrients.
Corn
For the beginner gardener, this is probably the most overrated seed preppers can stockpile.
Nitrogen requirements are very high and all kinds of pests will feast on the ears. Just before harvest, raccoons will bend the stalks over and will devour your corn crop. What raccoons do not eat, worms will.
Tomatoes
This will probably catch a lot of flack, but here goes. One of the riskiest crops someone can grow, besides corn, is tomatoes. Seeds have to be started at just the right time so the plants are producing before the summer heat is in full swing. Once the summer heat arrives, tomato plants have a habit of dying.
Cucumbers
Probably the most useless crop a prepper can have.
During a long term collapse of society, we should focus on crops that have calories and nutrients, cucumbers have neither. Cucumbers are almost devoid of nutrients and calories.
http://www.alloutdoor.com/2017/05/09/preppers-three-overrated-crops/