1. Fresh grapes on the skin of a layer of white hibiscus things, is wild yeast, so homemade wine, do not need to additionally add yeast Oh. 2. Angel sweet wine quartz is to do wine wine with yeast, not fermentation of wine with Oh. 3. low temperatures, the wine fermentation is slow, do not additionally put the yeast Oh, do not hurry. The wine will be fermented slowly.