Good question! I just found this:

>No license is normally required for selling uncut unprocessed fresh fruits and vegetables at farmers markets or vegetable stands in most areas. It is not even necessary to follow the Home Food Processor rules, so long as the produce is not prepared or processed. Local authorities may have other requirements based on the size of your stand or operation and the location where you sell. Zoning laws or HOA rules, for example.
But, in general, growing and selling fruits, vegetables or microgreens grown on your own property fall under rules for "farm stands," "retail farm stands," and "farmers' markets."
The state of Pennsylvania has a PDF describing farm stand requirements. In brief, these say That your operation is an Exempt Farmers Market Stands if you:

>
>sell only raw products from your garden or farm; fruits and vegetables that have been harvested but not processed in any way (no value-added work done, not a ready-to-eat product) This would cover vendors selling fresh
raw fruits and vegetables.

[source]