By "natural", I mean not genetically altered. I wonder if it would be as simple as defining a latitude range, then again, the right altitude at a certain latitude could change things, so maybe it's best to define other things, like...
Temperature range...
Amount of rainfall...
Amount of daylight...
Humidity...
Would it snow at all?
What else?
Then again, perhaps someone just knows a certain city, state, or region where the widest variety of LOCALLY grown natural produce is found.
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