where does yeast come from.
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Its everywhere in the environment a microorganism that digests carbohydrates as part of its life cycle, there are numerous species of yeast adapted to live off all sorts of fruits etc.
Commercial yeasts are produced in a factory they are selected strains of yeast with known Charecteristics, which gives a particular amount of fermentation in a given set of conditions.
In wine making Commercial yeasts are favoured especially for mass market production as they give a more controlled and reliable wine.
However many high end wines will use wild yeasts- these are the particular blend of yeasts that have come to be present in the vineyard over time.
Wild yeasts tend to give a more complex and individual flavoured wines, however the fermentation is more difficult to control than with Commercial yeasts.
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