Thanks for the links.
A lot depends on climate, the size of your parcel and soil quality.
Nothing is growing four months of the year here. I do however, make use of every square inch for growing things for the chickens to eat and rotate their feeding plots.
Here's the link again
http://www.thedailyshow.com/watch/thu-september-12-2013/monsanto---seed-patent-laws
You won't regret the 4 1/2 minutes of your time.