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This page talks about doomsday spinach. It gives information on how many plants it would take to provide a daily intake of 1200 calories for one person for one year.
There are about 7 calories in a cup of spinach. On a 1200 daily diet of lettuce it would take about 172 cups of spinach for survival. I would say that no one wants to eat 172 cups of spinach each day.
It would be best to grow spinach as part of a salad or for variety. In a 4 x 8 foot raised bed you can grow about 30 heads of spinach.
Here in San Antonio, we can grow spinach year round.
There are varieties that will survive the cold and some that will
survive the heat, sort of.
There are also varieties that you can pick some leaves and it will keep growing.
You can sun-dry spinach. It taste great when canned. But you need to have all the equipment on hand for this.
Spinach will last about 12 to 24 hours un-refrigerated. About 7 to 10 days
refrigerated. You would need to come up with some sort of cold storage
box. It might not last year round but maybe long enough to enjoy some
of the vegetables that do not last long un-refrigerated.
It is something easy to grow for the rabbits, chickens and goats, though.
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