Farms are able to build Vineyards which also produce crop. The level of the Vineyard built is the same as the level of the Farm. At higher levels Farms can build Vineyards without sacrificing laborers.
Farms at levels 7, 9, 11, 13, and 15 increase production rates by 10% at each level, for a maximum of 50%.
Farms can only be built on grass tiles. Despite there being 4 grass tiles, you can only ever build 2 Farms and one Lumbermill.
Farm can build:
Farm can research:
All structure and unit stats, cost to upgrade per level, and other abilities can be seen on the Official Database Entry
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