What tea to use for kombucha: black, green, white and blends compared

The basic kombucha recipe seems simple: tea, sugar, SCOBY, starter liquid. But the type of tea you choose affects everything - flavour, pH, fermentation speed, colour, and even the long-term health of your SCOBY.

There’s no absolutely wrong choice, but there are choices better suited to what you want to achieve.

Tannins, caffeine and nitrogen: the nutrients that matter

The SCOBY doesn’t just feed on sugar. The microorganisms in the culture need:

Tannins: polyphenolic compounds present in all true teas (Camellia sinensis). Tannins support the SCOBY’s structure and contribute to the production of organic acids. Without sufficient tannins, the SCOBY weakens over time.

Caffeine: a nitrogen source for the bacteria. It’s not essential in every single batch, but its complete long-term absence can slow down the culture. This is why decaffeinated tea is not a good choice as the sole tea.

Minerals and amino acids: present in tea in small quantities, they contribute to the culture’s nutrition.

All true teas - black, green, white, oolong - come from the same plant (Camellia sinensis) and contain these nutrients in different proportions. Herbal infusions (chamomile, mint, hibiscus, rooibos) are not “tea” in the botanical sense and lack tannins: they’re not suitable as the sole component, though they can be used in blends.

The classic starting point

Black tea is the most oxidised. It has the highest tannin content among teas, the strongest flavour, and a structure that supports the SCOBY very well.

Result in kombucha:

• Round flavour, slightly earthy, with well-balanced acidic notes
• Regular and predictable fermentation
• Dark amber colour
• Final pH between 2.8 and 3.5 under standard conditions

Why it’s the recommended starting point for first batches: Fermentation is more stable and less sensitive to variables. If it’s your first time, black tea gives you room to understand how the process works without additional variables.

Usable varieties: Assam, Ceylon, Darjeeling, English Breakfast, any quality unflavoured black tea. Earl Grey has added bergamot essential oils - best avoided, especially for first batches.

More delicate result, slightly different fermentation

Green tea is unoxidised or minimally oxidised. It has fewer tannins than black tea, a fresher and grassier flavour, and produces kombucha with a completely different character.

Result in kombucha:

• Light, floral flavour with more delicate acidity
• Slightly slower fermentation (fewer tannins available)
• Light yellow-green or golden colour
• Final pH similar to black, but with a very different aromatic profile

What to watch out for: With green tea, the steeping temperature is more delicate - steeping too hot (above 80°C) extracts bitter tannins that can make the kombucha astringent. Steep at 70–75°C for 2–3 minutes.

Usable varieties: Sencha, Gunpowder, Bancha, unflavoured Chinese green tea. Matcha is not suitable: the powder doesn’t filter easily and can clog the SCOBY.

The most delicate, for those who want to experiment

White tea is minimally processed - just the buds and first leaves of the plant, dried. It has very few tannins, a subtle floral flavour, and produces the lightest kombucha of the three.

Result in kombucha:

• Very delicate flavour, almost imperceptible without adding fruit in second fermentation
• Slower fermentation
• Very light colour, almost transparent
• Requires more attention to base tea quality

Not recommended as the sole tea for multiple consecutive batches: the low tannin content can weaken the SCOBY long-term. It works better blended with black tea (e.g. 70% white, 30% black).

How to combine them and what to avoid

Blending different types of tea is common practice and produces interesting results. The most used blends:

What to avoid in blends:

• Teas flavoured with essential oils (Earl Grey, fruit teas with added flavourings): essential oils can inhibit bacteria or alter the fermentation profile unpredictably.
• Decaffeinated tea as the sole component: lacks the caffeine that nourishes the culture long-term.
• Pure herbal infusions (chamomile, rooibos, etc.): without sufficient tannins, they don’t adequately support the SCOBY. You can use them in small quantities (max 20–30%) mixed with real tea.

Loose leaf or bags?

Both work. The difference is in the quality of the final result.

Loose leaf tea: generally superior quality, more complex aromas, better yield for kombucha. Requires a teapot or infuser.

Tea bags: more convenient, variable quality. Cheap bags often contain “fannings” - processing waste. They work for kombucha, but the aromatic profile is less interesting. Quality bags (whole leaves in fabric sachets) approach loose leaf results.

Standard proportions: 5–8g of tea (or 4–6 medium bags) per litre of water. Tea for kombucha is steeped slightly stronger than drinking tea, because much of the aroma is transformed during fermentation.

FAQ

Can I use ready-made tea (cold brew or bottled)?

No. Packaged tea almost always contains preservatives, flavourings, sugars, or other additives that interfere with fermentation. Always prepare fresh tea.

Does Earl Grey work?

Best avoided, especially for first batches. Bergamot essential oils can inhibit the bacteria. If you want a hint of bergamot, it’s safer to add it during second fermentation.

Can I use 100% herbal infusions?

Not as the sole component. Herbal infusions don’t contain enough tannins to nourish the SCOBY long-term. You can use them in small proportions (20–30%) blended with real tea.

Does the type of tea affect the final pH?

Slightly, but less than you’d think. Final pH depends mainly on temperature, SCOBY activity, and sugar quantity. Tea primarily affects flavour and fermentation speed.

I used a different tea and the SCOBY became darker/lighter - is that normal?

Yes. The SCOBY’s colour reflects the type of tea used. Switching from black to green tea, the SCOBY becomes lighter over a few batches. Not a problem.

Read also: How to choose and store a SCOBY → · Complete guide to kombucha fermentation →