This particular goal can be done once a week.
If you decided to purchase the Cape Town Vineyard in Cape Town, you can create a new wine by talking to the vineyard manager, Philip Nel, once a week.
In order to successfully launch a new wine, you need to complete the wine-making process (pruning, watering, and harvesting) and host a launch event for the wine.
This means you have to complete the following four sub-goals in order:
Once you've completed all four goals, Philip will call you and tell you how well your wine performed that week.
If your wine did fairly well, you'll earn 
2 and 
1,250. But if your wine did really well, and a restaurant tweeted about it, your reward is increased to 5 and 2,500.