“every family put in a Victory Garden in any open spaces”
That would work great for folks that have homes or live in rural communities.
Sadly, this country has so many living in urban areas with no space...it won’t work.
Even in the urban areas, there are enumerable open spaces...which could be utilized if people used some ingenuity and if local bureaucrats didn’t make it impossible.
And most of America is not exactly close-packed urban.