Farm

Farms
Farm gives constant food or "raw-farm product" supply to your city.

Potato Farm and Pumpkin Farm are direct suppliers. But Wheat Farm and Barley Farm needs another building to change their product consumable. Farms are the only production buildings (with the steam condenser) to have more than two months worth of stocks : they can store up to three years of harvest (1800 units).

Wheat and barley farms are also the only production buildings who can directly bring their resources to the buildings that needs them.

This implies that you don't really need to store wheat and barley in a granary for the windmill, the ranch, the abbey or the silk farm to get some : carriers can come straight from the farm.