I used to advertise that my wine was naturally fermented. I've stopped.
I had never added yeast, but I learned that most "natural fermentations" aren't what they claim to be, including mine.
Yeast l...
You can always call it something along the lines of "No added yeast". I think most people who know anything about alcoholic beverages are aware that, as you said yourself, yeast lives on just about every plant and appreciate if the strain used to ferment the beverage lived in somewhat of a "symbiotic" relation with the grapes.