Fermented Sodas · Beginner

Ginger Bug: How to Make a Ginger Bug Starter for Homemade Soda

A ginger bug is a wild yeast and bacteria starter made from fresh ginger, sugar and water. Day-by-day method, feeding schedule, signs it is ready, how much to use per batch of soda, how to keep it in the fridge, and fixes for a slow or mouldy bug.

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Bubbly ginger bug starter beside ginger, sugar and a grater

Updated October 2026 · 8 min read

A ginger bug is to homemade soda what a starter is to sourdough: a jar of wild yeasts and lactic acid bacteria, caught from the skin of fresh ginger and fed with sugar until it is lively enough to carbonate a drink. Once you have one, ginger beer, lemonade, root beer and fruit sodas are a few days away.

How to start a ginger bug

2 tbsp grated unpeeled ginger + 2 tbsp sugar to start
480 mL unchlorinated water (2 cups)
3–7 days at 20–26°C until bubbly
  1. 1
    Day 1 In a clean jar, stir together 2 tablespoons of finely grated unpeeled ginger, 2 tablespoons of white or raw cane sugar and 2 cups of filtered or boiled-and-cooled water. Cover with a cloth and a rubber band.
  2. 2
    Days 2–5 Every day, add 1 tablespoon of grated ginger and 1 tablespoon of sugar, and stir well. Stirring adds air and spreads the yeast.
  3. 3
    Watch for bubbles Small bubbles at the edges appear first, then a fizzy rush when you stir. The smell turns from raw ginger to yeasty and slightly sour.
  4. 4
    Ready When it fizzes vigorously within a few hours of a feeding, usually around day 3–7, it is ready to use.

Using a ginger bug

Strain off the liquid you need and add it to a cooled, sweetened soda base: about 1/4 cup per quart (60 mL per litre), or up to 10% of the batch for a faster start. Bottle, leave at room temperature for 1–4 days until fizzy, then refrigerate.

Replace what you took with fresh water, and feed the bug a tablespoon each of ginger and sugar so it is ready for next time. Every few weeks, strain out some of the spent ginger so the jar does not fill with pulp.

Ginger beer the classic. See homemade ginger beer.
Lemonade see fermented lemonade.
Root beer and fruit sodas see homemade root beer, or use fruit juice diluted with water.
Sugar weighed beside ginger bug starter, water and soda ingredients

Related calculator

Ginger Bug Soda Calculator

Sugar, ginger bug, ginger and water for any batch of homemade ginger beer or fruit soda, with ferment and bottling times by temperature.

Open calculator

Keeping a ginger bug going

On the counter feed 1 tablespoon each of ginger and sugar every day. Best if you make soda every few days.
In the fridge put a lid on and feed once a week. Take it out and feed it a day before use.
After a long break pour off most of the liquid, add fresh water, and feed daily at room temperature until it is bubbly again.

Troubleshooting

Watch for

  • No bubbles after a week Too cold, chlorinated water, or treated ginger. Fix all three before giving up.
  • Fuzzy mould on the surface Discard it and start again in a clean jar, stirring daily so nothing sits on top.
  • Flat white film Kahm yeast. Skim it, stir and feed. It is harmless but means the bug wants more stirring.
  • Smells strongly of alcohol or nail polish It is hungry. Feed it, or pour off some liquid and top up with water.
  • Sodas come out flat Use the bug at its most active, a few hours after feeding, and see the bottle times in the calculator.

FAQ

Frequently asked questions

How long does a ginger bug take to start?
Usually 3–7 days. In a warm kitchen (24–26°C) you may see bubbles on day 2 or 3; in a cool one it can take a week or more. It is ready when it fizzes up when you stir it.
Do I need organic ginger?
It helps. The yeasts and bacteria live on the skin, so use unpeeled ginger. Some conventional ginger is irradiated or treated, which can leave too few microbes to start a bug. Organic ginger is the most reliable.
Why isn't my ginger bug bubbling?
The most common causes are a cold room, chlorinated tap water, or treated ginger. Move it somewhere warmer, use filtered or boiled-and-cooled water, keep feeding daily, and switch to organic ginger if nothing happens after a week.
How do I store a ginger bug?
Keep it in the fridge with a lid and feed it 1 tablespoon each of ginger and sugar once a week. Take it out and feed it a day before you want to use it, so it is bubbly again.
Is a ginger bug the same as a ginger beer plant?
No. A ginger bug is a wild culture you start yourself from ginger. A ginger beer plant is a specific, gelatinous symbiotic culture of a yeast and a bacterium, passed between brewers like kefir grains. Both make ginger beer.
Is there alcohol in ginger bug soda?
A little. Short ferments chilled as soon as they are fizzy usually stay under about 1% ABV, but warm, long ferments climb higher.
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