How to Grow a Scoby for Kombucha Tea

Understanding Scoby: What is it Exactly?

Scoby Image

Scoby is an acronym that stands for “Symbiotic Culture Of Bacteria and Yeast”. It is a rubbery layer that is formed on the surface of sweetened tea during the process of fermentation, which is used to make kombucha. The scoby is essentially a live culture that is responsible for turning tea into a fizzy, tangy, and slightly vinegary drink called kombucha. It is often considered the heart and soul of kombucha brewing, as without it, making your own kombucha at home would be impossible.

The scoby itself is a collection of various bacteria and yeasts that work together in a symbiotic relationship. Each strain of bacteria and yeast has a specific function in the fermentation process, and they all work together to create a healthy and balanced environment for fermentation to occur. The bacteria produce organic acids and probiotics, which are good for the digestive system, while the yeast helps in the breakdown of sugar and the creation of carbon dioxide, which results in the signature fizziness of kombucha.

Scobies can be purchased from specialty stores or online retailers, but a much cheaper and more fulfilling option is to grow your own from scratch. Growing your own scoby is easy, fun, and a great way to get started with homebrewing kombucha. All you need is a few basic ingredients and a bit of patience to get started. In the next section, we’ll go over the step-by-step process of how to grow a scoby from scratch.

Sourcing Scoby: Where to Get Started

Scoby Tea Fermentation

Before you can start brewing your own kombucha, you need a scoby. So, where can you get one? There are a few different options to consider, depending on your preferences and location.

1. Purchase a Scoby Online

If you don’t know anyone who brews kombucha, or if you’re having trouble finding a local source for a scoby, buying one online may be your best option. There are numerous websites that specialize in selling kombucha supplies, including scobys. While prices will vary depending on the seller, you can typically purchase a scoby for between $10 and $20. Before buying, make sure to read reviews and choose a reputable seller to ensure that you’re getting a healthy scoby.

2. Ask Your Local Kombucha Brewer

Kombucha Brewing

If you’re lucky enough to live in an area with a kombucha brewery, asking them for a scoby is a great way to source one. Some brewers may sell scobys for a reasonable price or give them away for free to help promote the spread of this healthful beverage. Others may be willing to barter for scobys, especially if you have an interesting or unique skill or product to offer in exchange.

Extra Detail: Contact your local kombucha brewers to know if they have any scoby to give or sell. You can also check their website for available scoby or any nearby outlets that sell one. Most of the time, the brewers use fresh scobys for every batch, so they could give you their extra ones. You can also visit their taproom and order kombucha to enjoy and ask them if they sell any scoby kits.

3. Find a Scoby on Social Media

Many kombucha enthusiasts and homebrewers use social media to connect with others and discuss their craft. Facebook groups, for example, are a great place to find people who are willing to share their scobys. You can also check on Twitter and Instagram using #kombucha or #scoby hashtags to find people sharing their spare scobys.

Extra Detail: Join a Facebook group or search for communities and forums within your area. If you find someone giving away or selling scobys, make sure to ask for clear photos of the scoby before making any transactions. Ensure that the scoby seems healthy and emits no strange odors. If your guts tell you something is off, then listen to it.

4. Make Your Own Scoby

How to Grow a Scoby from Kombucha

If all else fails, you can always make your own scoby. To do this, you’ll need a bottle of plain, unflavored kombucha, preferably raw and unpasteurized. Pour the kombucha into a clean and wide-mouthed jar, cover it with a cloth or paper towel, and secure it with a rubber band. Place the jar in a warm, dark place, and wait for a few weeks for the scoby to form on the surface. Once it’s grown, you can use it to start brewing your own kombucha.

Extra Detail: Using a flavored kombucha will not work because of its acidity level, sugar content, and other factors that might affect the scoby-making reaction. You can try using raw, unflavored store-bought kombucha, which is more accessible when making your own scoby, but making it from scratch is always better since you know what’s going on in your scoby’s growing process.

However, sourcing your scoby, there are many options and personal preference to choose from. So, choose your source that suits you best and start brewing your kombucha tea.

Creating the Perfect Environment for Scoby Growth

scoby growth environment

Creating the perfect environment for scoby growth is essential if you want to produce the perfect kombucha. A healthy scoby is the key to a high-quality kombucha, so it is vital to ensure that your scoby is in the best possible environment to thrive. Here are some tips on how to create the perfect environment for scoby growth.

1. Temperature

scoby temperature

The ideal temperature for scoby growth is between 75-85°F (24-29°C). Anything below that temperature will slow down the fermentation process, while anything above that temperature will kill the scoby. Therefore, it’s important to maintain a consistent temperature throughout the fermentation process. You can achieve this by keeping your brewing vessel in a warm place, like a kitchen counter or a closet, away from direct sunlight, and other temperature fluctuations like drafts. If you live in a colder climate, you may want to invest in a heating mat or wrap to keep the temperature steady and consistent.

2. Light

scoby light

Although scobies are not photosynthetic, they do respond to light. Too much light exposure can damage the scoby, leading to a lower quality kombucha. Therefore, it’s important to keep your brewing vessel in a dark or dimly lit area. If you need to check on your kombucha, use a flashlight or a dim light source. Some people prefer using a cloth or towel to cover their vessel to ensure complete darkness.

3. pH Level

ph level

The pH level of your kombucha should be between 2.5-4.5, which is the optimal range for scoby growth. The pH level can be affected by many factors, such as the type of tea used, the brewing time, and the presence of sugar. To ensure that your pH level is in the correct range, use a pH strip or a digital pH meter. The pH should be tested before and after fermentation. If the pH level is too high or too low, it can damage the scoby, leading to a lower quality kombucha. Adjust the pH level by adding more tea, sugar, or water to the mixture.

4. Oxygen

scoby oxygen

Like all living organisms, scobies require oxygen to survive. Oxygen is necessary for the growth and health of the scoby, as it helps to nourish it and prevent harmful bacteria from forming. Therefore, it’s important to ensure that your brewing vessel has access to oxygen. You can achieve this by covering your vessel with a cloth or paper towel, or using a breathable lid for your brew. However, be careful not to expose the scoby to too much oxygen, as it can slow down the fermentation process.

By following these tips, you can create the perfect environment for scoby growth, which will result in a high-quality kombucha. Remember, the key to a healthy scoby is maintaining a consistent and balanced environment.

Feeding Your Scoby: Navigating the Fermentation Process

Feeding Your Scoby: Navigating the Fermentation Process

When it comes to growing a scoby, feeding it is a crucial part of the fermentation process. The scoby, which stands for symbiotic culture of bacteria and yeast, is responsible for fermenting tea and producing kombucha. It’s important to take care of the scoby throughout the fermentation process to ensure that it grows properly, and to produce delicious and healthy kombucha. Here are some tips on how to feed your scoby and navigate the fermentation process.

The Basics of Feeding Your Scoby

At the most basic level, you’ll need to feed your scoby with tea and sugar in order for it to grow and thrive. The sugar is not for you, but rather for the scoby, which will consume it during the fermentation process. Without sugar, the scoby cannot produce kombucha. You’ll also need to give the scoby a steady supply of oxygen, through regular stirring or shaking. This helps keep the fermentation process active and healthy.

The Importance of Temperature

Scobys grow best in a warm, dark place, ideally around 75-85 degrees Fahrenheit. If the temperature is too low, the fermentation process will slow down or even stop, preventing the scoby from growing. Conversely, if the temperature is too high, it can kill the bacteria in the scoby, ruining the fermentation process entirely. Make sure to keep your scoby in a warm, dark place, like a pantry or cupboard, to ensure that it grows properly.

Choosing the Right Tea

When it comes to feeding your scoby, choosing the right type of tea is crucial. Kombucha is traditionally made with black tea, but you can also use green tea or a combination of the two. Just make sure that the tea you choose is organic and free of any additives or flavorings. The scoby is sensitive to chemicals and additives, which can harm its growth and the overall health of the kombucha. Additionally, using filtered or distilled water can help maintain the health of your scoby.

Understanding pH Levels

Another important factor in feeding your scoby is understanding pH levels. The pH of your kombucha should be between 2.5 and 4.5, which is between the acidity of vinegar and lemon juice. If the pH is too high, it can indicate that the kombucha has been over-fermented and may taste too sour. On the other hand, if the pH is too low, it can mean that the kombucha has not fermented enough and may taste too sweet. Measuring the pH level of your kombucha can help you determine when it’s ready to drink, and when you need to adjust the feeding process for your scoby.


Feeding your scoby is an essential part of growing healthy kombucha, and it’s important to understand the various aspects of the fermentation process in order to do it right. By choosing the right tea, monitoring temperature and pH levels, and providing the scoby with a steady supply of oxygen, you can help ensure that your kombucha is both delicious and healthy. Feed your scoby with care, and you’ll be rewarded with a healthy and tasty beverage that can provide numerous health benefits.

Maintaining Scoby Health: Troubleshooting Common Issues

Kombucha scoby issues

As resilient as scobys are, they can face a few problems that can damage their health and impact the quality of your kombucha brew. Here are some common issues you may encounter while growing your scoby, and how you can troubleshoot them:

1. Mold

Kombucha mold

Mold is a common issue with kombucha brewers, and unfortunately, it’s a problem that can quickly spread and contaminate your entire batch of kombucha. The most obvious sign of mold contamination is visible green, black, or white mold growth on the surface of your scoby. If you spot any signs of mold, it’s essential to discard the entire batch of kombucha and start anew with a fresh scoby. To prevent mold growth, ensure that your brewing environment is clean and properly sanitized, and use only clean water, quality tea, and sugar-free from additives to brew your kombucha.

2. Thin Scoby

thin scoby

A thin scoby is a sign that your scoby isn’t as healthy as it should be. It could be due to poor brewing conditions, weak tea, or the unfavorable growing environment. To thicken your scoby, ensure that you provide it with proper brewing conditions that mimic its natural environment, such as enough food, oxygen, and temperature. Consider using a heating mat or a warmer brewing spot to keep your kombucha at a consistent temperature. Also, make sure to brew your kombucha long enough to allow the scoby to grow and thicken, and use fresh, high-quality tea leaves.

3. pH Imbalance

kombucha pH imbalance

Each batch of kombucha produces acid, which lowers the pH level, but at times, the pH level can become too high or too low, creating an imbalance that affects your scoby’s health. A pH below 4.0 makes the environment too acidic, and a pH above 4.5 makes it too alkaline, which can slow down the fermentation process and weaken your scoby. To fix this issue, test the pH level of your kombucha regularly using a pH strip or meter and adjust the pH using distilled white vinegar for acidifying or baking soda for raising the pH level. Allow your kombucha to ferment long enough to reach the required pH level and taste before bottling.

4. Sluggish Fermentation

Sluggish Kombucha fermentation

Slow fermentation or no fermentation at all can be a worrying sign in a kombucha batch, especially when you don’t observe any scoby growth. The problem could be due to a weak scoby, exposure to high or low temperatures, or the use of poor-quality tea or water. To troubleshoot this issue, first, check that your brewing conditions, including temperature, food, and aeration, are optimal for the scoby’s growth. Second, make sure to use high-quality tea and sugar-free from additives or avoid using tap water that contains chlorine, which can kill the yeast and bacteria.

5. Oily or Slimy Scoby

Kombucha oily scoby

An oily or slimy scoby is often a sign of an overgrowth of yeast, bacteria, or both on your scoby. This overgrowth can cause the scoby to become slimy and difficult to handle during the brewing process. To fix this issue, try using a more breathable cloth or a cheesecloth to cover the brewing jar to increase aeration and prevent moist conditions that can cause an overgrowth. Also, reduce the amount of sweetener used in the brew to discourage yeast overgrowth and avoid contaminating your scoby with flavored teas or additives that can damage its health.

By troubleshooting these common scoby issues promptly, you can maintain a healthy and active culture that produces high-quality kombucha. Always remember to use clean water, fresh tea, and sugar-free free from additives and invest in proper brewing equipment to ensure a smooth brewing process.