A Year of Kombucha Experiments

Here are my notes from a year of experimentation with making, flavoring, and drinking kombucha. If you haven’t heard of kombucha, you’d better get to searchin’.

Tea types

Regular black tea

This is the first base I tried. It makes your standard, run-of-the-mill kombucha. This is also what keeps the SCOBY happy with the nutrients it needs.

Creme Maurice

Creme Maurice is a fine broken-leaf tea with strong vanilla notes, which come out in the final product. This is my favorite base tea so far.

Irish Breakfast

While I can immediately tell the difference between regular black tea and Irish breakfast tea in a normal cup, I cant really tell the difference in a completed batch of kombucha. I do end up using Irish breakfast tea more often for kombucha because it is what I usually have on hand.

Silk Road

Silk Road is a blend of Assam and China breakfast teas. It is wonderfully malty and earthy. In a batch of kombucha brewed with this tea, I can taste hints of maltiness.

1/3 Green 2/3 Irish Breakfast

This creates a lighter kombucha (in both color and flavor). If you’ve had regular black tea kombucha and think it is too strong, I recommend trying various proportions of green to black tea.

Length of Fermentation

I’ve tried varying lengths of fermentation, anywhere from 7 to 14 days. Here is what is going on around each of those times:

  • < 7 days: Pretty sweet (assuming your base ratio is 1 cup of sugar per gallon of water). The SCOBY is starting to consume the sugar. A new SCOBY will start to form on the surface, but won’t be very thick.
  • 7 days: Still lots of sugar in the tea, pretty sweet, but you can start to taste some acidity and tartness coming out. The SCOBY is growing.
  • 10 days: Here the real kombucha flavor comes out. More sugar has been consumed, the SCOBY is bigger, and the kombucha is more tart. If you smell the top of the batch, you can pick up some vinegary notes the SCOBY is giving off. You may even see some bubbles that have formed around the SCOBY.
  • 14 days: This is when I usually stop my main fermentation and start a new batch. I either start my second fermentation or bottle the finished kombucha. Most of the sugar has been consumed and the flavor is nice and tart with hints of the tea coming through. A full second SCOBY has formed, which I sometimes peel off and give to friends.
  • > 14 days: If left longer than 14 days, the kombucha takes on a distinct vinegary flavor. The longer it goes, the stronger the flavor gets. The SCOBY will eventually consume all traces of the sugar and it will stop growing.

Starter Kombucha

I have used varying amounts of starter kombucha from 1/2 cup to 3 cups and found that it doesn’t affect my final outcome much besides for keeping it from going bad in the first few days. (The higher acidity keeps the wrong bacteria away while the good bacteria gets going.)

Secondary Fermentations

After I siphon the base kombucha from the crock after 14 days, sometimes I like to flavor it. This happens over two days in a second jar without a SCOBY. I use quart mason jars and put whatever fruit or other flavorings I want directly into the kombucha and let it sit covered for 2 days. Not only does this flavor your kombucha, but if you add something with sugar (like fruit), it will give your brew a nice fizz.

It is important to add all flavorings after the original kombucha is finished fermenting. If you try to add it to the first fermentation, you risk weakening or killing the SCOBY.


While hibiscus tea is usually so sour that you don’t dare drink it without sweetening it first, hibiscus kombucha is much different. When fermented with kombucha for two days, hibiscus petals shed their tanginess and a complex floral flavor results. I find it delicious. 2 tbsp to 16 oz of kombucha.

Dried Orange Peel

Not good. I don’t recommend this. It tastes like a yeasty skunked Oberon. Don’t waste your hard-brewed kombucha on this.


I first tried 6 dried juniper berries in a 16oz bottle, but after a week the juniper taste was faint. So I upped it to 14 berries. Still not much. After chalking it up as a loss, I came across a brine that called for crushing juniper berries before adding them. This makes all the difference. I put 4 tablespoons of crushed berries in a quart jar with kombucha for a day and a half and came out with a light juniper flavored kombucha that is very drinkable and refreshing.

Lemon and Ginger

I sliced up half a lemon and about 2 square inches of fresh ginger and let it sit in a quart jar with fresh kombucha for a day and a half. The result was delicious, but has a bit of a bite. It takes me a while to get through a whole 32oz bottle of this because I don’t want to drink it all the time. Perhaps in the future I’d use less ginger and keep the amount of lemon the same.

Flavoring in Bottles

Flavoring in bottles is super simple, but there are a few downsides:

  • Whatever you push down into the bottle is a pain to get out, even with a bottle brush.
  • Things like strawberries get slimy after a few days.
  • Adding things to the bottle could introduce bad bacteria. You probably won’t get sick, but your kombucha will taste a bit off.

I’ve stopped adding favorings directly to the bottle and use the secondary fermentation method instead. It is more work, but produces better results.


This is one of the easiest ways to flavor kombucha and you get a strong flavor even after a few hours. I prefer to use dried strawberries if I’m going to leave them in the bottle instead of doing a secondary fermentation. I flavored a few batches with strawberries and then got tired of it and moved on to other flavor experiments. Strawberry has never been my favorite flavor in general, though.

Strawberries and Ginger

Again, easy and produces great results with a strong flavor in a short period of time. If you are new to making kombucha and are looking for an easy win, this is it. 2-3 sliced strawberries and 2 slices of fresh ginger and you are good to go. If you don’t want the strawberries to get slimy in the bottle, make sure to do a secondary fermentation instead.

Future Experiments

  • Secondary fermentation with lemons (I think this will go especially well with a green tea kombucha)
  • Secondary fermentation with black cherries (Should go well with the Creme Maurice tea)
  • Secondary fermentation with sage and blackberries
  • Secondary fermentation with fresh mint (I think this will go well with a lighter, greener blend)
  • Different ratios of black to green or oolong teas
  • Pu-erh tea as the base (I’m actually trying this right now, it should be done next week. I’ll edit this post with the results.)
  • Trying out adding a bag or two of yerba mate with a 1-2 ratio of green to black tea.
  • Full green tea batch
  • Flavoring with lime juice in the bottle
  • Secondary fermentation with lavender or jasmine blossoms
  • Flavoring with oil of Bergamot with a 100% black tea to get an Earl Grey flavor (Using Earl Grey tea as the base might kill your SCOBY due to the essential oils, so you only want to add them afterward)
  • Second fermentation with concord grapes, perhaps with a green tea kombucha.
  • Green tea kombucha mixed with lemonade to make something similar to Baohaus’s Lang Lang.

Soon I’ll have a post up with links to my kombucha gear and instructions on how to get started with brewing it. If you are interested in getting started but need a SCOBY, tweet at me (@cagrimmett) and I’ll send you one if I have any extras available.

4 thoughts on “A Year of Kombucha Experiments

  1. lynne lasser June 17, 2018 / 4:30 pm

    Have you ever tried sous vide equipment to ferment, keeping temp at an even 80? I would think it could work for both primary and secondary fermentation. Yogurt only takes 5 hours with an immersion circulator since water is more conductive than air.


    • Chuck June 17, 2018 / 5:00 pm

      I haven’t! This is a great idea. Turn around kombucha much faster.


  2. Darla Strickland September 4, 2019 / 5:44 pm

    I add a small amount of simple syrup for fizziness to my 2nd ferment bottles. I flavor by putting cut up flavorings in a fold over paper tea bag, then just pull the whole thing out when it’s flavored and ready to drink. I tend to use dried things- rose hips, cinnamon chips, hibiscus plus chopped ginger. I’m experimenting with juniper berries and just found you through a search. Thanks for all of the info!


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