Board Thread:Suggestions Forum/@comment-25672535-20150213205750/@comment-25565811-20150213211833

Yes, yeast is added to start fermenting. When you put a barrel of fruit in the sun, it's also possible that is starts fermenting without yeast. Also wine starts fermenting with the yeast which is already on the raisins or in the cellar from the last years. Nowadays they add special yeast, to make fermentation take place in a more controlled way. So you can add it, but you don't nessecarily need it.