Some of these determinations are extraordinarily complicated. Agree with Kaybee that the Call report should drive the reporting and that we would consider this an ag loan.
One way to look at it, is are they growing/raising something and selling it for a profit? We also sometimes refer to the NAICS codes to help us in our determination.
We have had similar struggles making determinations on Ag related businesses as well as an Apiary. Don't even get me started on the worm farm...
In regard to you using food grown for consumption as the determining factor, I would not rely on solely on that. For example forestry falls under Ag (growing tree plots which will eventually be used for timber) but will never be consumed.
Best of luck!
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The opinions expressed are mine, do not represent the opinions of my employer, and they are not to be taken as legal advice.