Vineyards can be built from Farms. They take ten minutes to construct, and take four hours to mature into crop. You then have six hours to harvest said crop before the vines die and your vineyard becomes "A bunch of dead plants".
A vineyard will have the same level as the Farm that constructed it. Up until level 10, Vineyards cost labor to construct, which is a valuable resource.
Once harvested or dead, they must be removed which takes ten minutes.
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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