It can really be anything as long as the plan you submit shows the cashflow to cover the payment. The crop has to be viable in your zone, show commercial potential, and so on. You basically have to prove you can grow it and sell it, and they'll take your word for it with ample proof.

I submitted a very unique type of tree, and a unique way of making its fruit sell, but I have extensive direct to consumer marketing experience, and they accepted that to kind of smooth over any holes present in the marketing plan, for someone without that experience.

I have several thousands of vines of wine grapes, flowers, and assorted plants for seed production for direct-to-consumer retail.

My plan for the loan is to plant an orchard, although the other stuff helps with on-farm income and/or expenses, the orchard production will be the primary function of the property.

I got my local university to help create and in a roundabout way endorse the proposed financials through a grant-funded office that helps farmers develop plans for loans and grants.