Herbal Tea is not recommended for the long term health of the culture. The Kombucha culture requires certain nutrients (nitrogen, tannins, polyphenols, etc) that are provided by Camellia sinensis, the tea plant, in order to thrive. Herbal teas contain much lower levels of these nutrients, sometimes none at all.
Additionally, many herbal teas are made with essential oils which should never come in contact with your culture.
The first batch or two made with herbal tea will likely brew as normal, but over time the culture will mutate and/or degrade. If you must brew with herbal teas, make sure they are organic and oil free. Then, either blend in 25% black or green tea OR brew every 4th batch with regular tea to reinvigorate the culture.
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Posted in: Simple Kombucha FAQ