The following is purely opinion and, again in my opinion, should have no influence on the development of the game... However, "grazing" lands being protected for grazing food (i.e. grasses, etc) makes sense. I was picking mushrooms.
If, for the sake of argument, Groves were considered protected, then it would make sense for them to be protected for the use of wood, fields (farms) for food, and pastures for grasses.
Unless, and here's the main caveat that makes me say do not allow the previous _opinion_ to influsence the development of the game, *everything* is 'protected' for *everything.*
In any case, I'll just have to be careful to pick mushrooms when it's night and people are less likely to be wandering around...