To be fair, we hardly see any sort of vegetable farms or orchards in most zones with civilization. Highmountain, the Wandering Isle, Valley of the Four Winds, Elwynn, Westfall, WoD Shadowmoon, and a few others are notable, and that's it. Even in Suramar they did a good job showing what all is needed for the Nightborne to survive, and they only have a vineyard. Yet they have cakes all over the city made from, I assume, some sort of wheat and dairy products.
No Troll zone or Orc zone (BC and WoD, as well) has a farm, aside from the pig farms in Durotar - at least as far as I can remember off hand. Then again, the vast majority of Orc (and a couple Troll) areas aren't exactly hospitable for vegetation.