Farm

The Farm is a class of building that produces a slow source of food for the civilization. The amount of food a given farm will produce is limited before it depletes, however the building can be replenished (automatically with auto-replenish turned on). As such, farms can provide a theoretically unlimited amount of food for the civilization long after other sources have been depleted, provided that the player can maintain a steady source of wood.

Depending on the civilization, the gatherable amount per farm and the gathering speed can be improved through economic upgrades at the Economic Research building. The Mongols lack the ability to construct farms and therefore must rely solely on natural food sources as well as the small amount of food they get from chopping wood.

Ingame Description
"Renewable source of food. Requires one Villager.  Provides a limited amount of food before being exhausted."