Grapes should have a variation depending on what the original terrain was.
Here are some suggestions to work with; think about; discuss.
Grassland Grapes: Standard purple, that we have now.
Forest Frühroter: A red grape, makes white wine.
Mudflat Mujuretuli: A red grape, makes red wine.
Heath Humagne: A white grape, makes white wine.
Moor Muscat: A white grape, makes white wine.
Now, the reason for all the variety, is the effects.
I figure, if there are multiple wines with varying effects, people would either have to claim many areas, just to make them all.
Or they could trade with people who produce that wine.
I also wanted to bring up placement of wine barrels.
Wether they sit in a mine, a cellar, inside, or outside.
They should have varying outcomes like cheese.