I imagine there is some gray areas. But generally, I would think even a prairie restoration area should be marked as ‘wild’ at some point. Particularly, when there is no way to discern what was planted and what has seeded since the planting. I know I’m part of a group studying a Prairie/Fen which has many areas that have been managed with seeding and burning. One area has an entire ‘hill prairie’ that was transported from a different location. I would think all of those examples should be marked as ‘wild’ and that would be the most helpful for those studying the biodiversity of the particular Prairie and Fen location.
The other gray area is volunteers that pop up in vacant lots and gardens and yards. These I would also presume to be ‘wild’ if they were not planted and not intended to be there. But if you just planted a bunch of pale coneflowers in your front lawn, that should be ‘cultivated’ even if it is a naturally occurring plant in your area.