@ rowancd
Or are you preparing Schedule F (Farming)?
When I mentioned those 4 business codes above, I originally mentioned "Schedule C" but removed it, since I'm not sure exactly what form you are referring to--Sch F or Sch C. The term "Business code" implies Sched C, but you may be referring to Schedule F (Farming) where it asks for "Principal crop or activity."
If you are preparing Schedule F, it has a choice of more general codes, such as 111900 "Other crop farming" or 111400 Greenhouse production. See the back (Page 2- Part IV) of a Schedule F at this link
https://www.irs.gov/pub/irs-pdf/f1040sf.pdf
Whether to use a general code on Sched F or Sched C or a more specific code as I mentioned earlier is up to you. If you're preparing Schedule F, the Schedule F itself and the Schedule F Instructions just ask for one of the general agricultural codes listed on the back (page 2).
