Read through 'til the end of the article.
The idea that the common man will just start a victory garden is a flawed assumption. It's going to be impossible to even grow potatos without an underground greenhouse in North America.
If you start with the foreknowledge you gain from reading Vault-Co, your end result will be much more optimal to actually go on living.
Our next project, the permaculture lab, was never intended to be anywhere other than under a meter of soil. We are working on the proposition that the future is going to be a very, very cold place even here in Australia, with irregular sunshine and little heat. We have planned on growing food the same way they do in Antarctica for a role model.
Also remember, you can't harvest a garden that is aboveground in a radioactive environment. So a piece of thick translucent plastic ain't gonna cut it.