The Ultimate Guide to Mushroom Liquid Culture (LC) in 2026

How To Make Liquid Culture? The Ultimate Guide

29TH MARCH 2026 • 12 MIN READ

A close-up, horizontal view of a 10ml mushroom liquid culture syringe filled with visible white mycelium clouds against a clean white background.

What is a Liquid Culture?

Also known as LC, a liquid culture is a sterile, nutrient-rich liquid solution that allows mycelium (white, string-like mushroom networks) to grow. It is known for its quick and aggressive colonisation, while also being less prone to contamination compared to spore syringes, which is why it is commonly used by beginners for mushroom cultivation.

Today's liquid culture recipe works for most psychedelic mushrooms like P. cubensis, such as Golden Teacher or Penis Envy, but also for most medicinal and edible mushroom varieties.

Liquid Culture Vs. Spore Syringe

Comparison of mushroom liquid culture jars and syringes on the left versus mushroom spore prints, swabs, and spore syringes on the right.

What is the difference between liquid culture and spore syringe? The main difference is that a spore syringe does not contain any living mycelium, but only spores. The spores are in a clean, sterile solution, but without any nutrients, which prevents mycelium from growing. Once the spores are given nutrients, they will start to germinate and form mycelium.

The mycelium solution, on the other hand, contains mycelium. That is great for growth speed, and since it is already healthy mycelium, it is also less prone to contamination. The only downside is the legal status of living mycelium, at least for active strains. Spores are usually legal for research purposes because they do not contain the active components, but the mycelium in the LC can contain traces of psilocybin.

Now, which one is better? It depends what you want to do. For inoculating a grain bag or an all-in-one bag, a liquid culture syringe is always superior due to quicker and stronger growth. But if you use agar plates, spores are a great alternative. Just keep in mind that since the liquid culture contains living mycelium, it is often prohibited, while spores are legal to possess in most countries for research purposes. So it is best to just get the spores and make the LC yourself.

Which one is better?
Features	Liquid Culture	Spore Syringe
Contains	Living Mycelium	Spores
Colonisation Speed	Fast (Active Mycelium)	Slower (Needs Germination)
Contamination Risk	Low	Higher
Shelf Life	Shorter (6–12 Months)	Longer (Several Years)
Genetics	Isolated (Predictable)	Genetic Lottery (Variable)
Legal Status	Often Restricted	Mostly Legal (Research Only)
Price	More Expensive	Affordable

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Some of the most popular Psilocybe cubensis varieties, such as Golden Teacher, B+, and Ecuadorian, are well-known among mycologists for being easy to grow, resistant to contamination, and quick to develop.

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How to Make Golden Teacher Liquid Culture?

This how-to guide will lead you step by step through how to make a liquid culture from a spore syringe. This LC recipe is used by hobby mycologists and at industrial scale all around the world, since it provides optimal nutrients for quick growth.

Ideal for P. Cubensis like Golden Teacher or Penis Envy, but also for most medicinal mushrooms like Lion's Mane or edible mushrooms like oyster mushrooms.

Published: 2026-03-29 • Updated: 2026-03-29

⏱️Prep: 15 min

🕐Total: 60 min

📁DIY

How to Make Golden Teacher Liquid Culture?

Supplies/Materials

600ml Distilled or Filtered Water
12ml Corn Syrup
1g Light Malt Extract
1g Peptone (Optional)

Tools

Modified Mason Jars (1 L/1 qt.)
Golden Teacher Spore Syringe
Pressure Cooker / Cooking Pot
Scale
Aluminum Foil
70% Isopropyl Alcohol
Marble / Stone (For Breaking Up Mycelium)

Instructions

1.
Add Corn Syrup, LME, and Peptone to Water

First, make sure your mason jars are suitable. This recipe is made for one mason jar, ideally with a capacity of 1L. If you are still looking for a good option, we recommend the mason jars we use ourselves, which you can find here.

It should be heat resistant up to 121°C (250°F) and needs a modified lid with an injection port, where you can inject the spores later without opening the jar, avoiding unnecessary risk of contamination. You will also need a way for air exchange, which is why you need a second hole covered with micropore tape or a filter disk. A plain hole covered with micropore tape is the easier option.

Then, fill the jar with distilled or filtered water. You could also use tap or bottled water, but they may contain chemicals or minerals that could affect the mycelium's growth. Now add the corn syrup, light malt extract and, if you have it on hand, the peptone.

Why corn syrup? It does not affect visibility unlike honey, provides easy to access nutrients for the mycelium, is heat resistant and does not crystallise as quickly as other sugars.

Why peptone? It is not necessary, but provides extra nutrients for quicker and stronger mycelium growth.
2.
Mix Until Fully Dissolved

Mix thoroughly until everything is fully dissolved. Make sure the corn syrup does not stick to the bottom or the sides of the jar. Stir until the solution is clear and you no longer see any clumps or residue.

If the corn syrup is hard to dissolve, try using slightly warm water, as this helps it break down more easily. Do not worry if the liquid looks a little cloudy at this stage, this is completely normal.
3.
Preparation for Sterilisation

Now, add your marble. You can also use a small stone, though professionals often use a magnetic stir bar, as it breaks up the mycelium most effectively. It is necessary to break up the mycelium later on in the process for quicker growth. Then, take your lid and close the jar.

Now, wrap some aluminium foil around the lid so it is fully covered. This is important because it protects the injection port and the air exchange filter disk during sterilisation.
4.
Sterilise the Mixture

Now use your pressure cooker at 15 PSI for 30 minutes or 12 PSI for 45 minutes to sterilise the mixture. I recommend sterilising several jars at once, just in case one gets contaminated.

If you do not have a pressure cooker, you can also try a steam bath instead. I have not tried it for a liquid culture solution, but for agar it works pretty well at around 1 hour. Keep in mind though that a steam bath may not reach the same temperatures as a pressure cooker, so sterilisation may be less reliable.

Learn more about sterilisation & pasteurisation.
5.
Let it Cool Down

After sterilising, let the whole pressure cooker cool down for a few hours until it has reached room temperature. This is important because injecting the spores into a still warm jar could kill them, ruining the entire batch.

Afterwards, the solution will have a golden yellowish colour, due to the corn syrup and the LME. You may also see small particles floating around in the solution. These are just nutrient fallouts, which will be consumed by the mycelium over time.
6.
Inoculation

Once your jars have cooled down, you can prepare everything for the inoculation. Make sure to work in a sterile environment, like a still air box or in front of a laminar flow hood, and use gloves, a mask and 70% isopropyl alcohol to disinfect everything.

Now you can start removing the aluminium foil. Make sure the jar is still fully closed and that everything, including the injection port and micropore tape, is still in place.

Take your spore syringe and shake it to evenly distribute the spores. If you are reusing a needle, briefly flame sterilise it and let it cool down before proceeding. Next, screw on the needle, wipe the injection port with isopropyl alcohol and let it dry for a few seconds before inserting the needle. Dispense 2 to 4ml of the spore solution per jar. This should be plenty of spores.

You can also use another liquid culture syringe or another form of mycelium like colonised agar, but this is slightly more prone to contamination because you have to open the lid.

💡
Before you use the spore syringe, I recommend to test it on agar to see if it is clean, since spores can be contaminated.
7.
Colonisation and Storage

Store your jars at between 21 and 28°C (70 to 82°F) in a dark spot and make sure to avoid direct sunlight entirely. Anything lower than 21°C (70°F) will cause slower growth, while anything higher than 28°C (82°F) will encourage bacterial growth if present. That range is the sweet spot for most P. cubensis strains.

After 7 days, you should be able to see the first signs of growth, which will appear as small white clouds forming in the solution. From this point on, shake the jar regularly and use your marble to break up the mycelium. I recommend doing this once a week. Over time, the cloud of mycelium will slowly start to grow.

After around 3 to 4 weeks, depending on the strain and other factors like genetics or temperature, the liquid culture should be ready to be used to make liquid culture syringes.
8.
Filling Your Liquid Culture Syringes

Once your liquid culture is fully colonised, you can start filling your liquid culture syringes. This step is important so you can use your LC properly. Before you start, break up the mycelium one more time to distribute it evenly throughout the jar, then let it settle for a minute so it is evenly suspended in the solution.

Make sure you are working in a sterile environment again. Disinfect the injection port with 70% isopropyl alcohol and let it dry for a few seconds, then screw the needle onto the syringe. Both should ideally be pre-sterilised. If you are reusing the needle, flame sterilise it for 10 to 15 seconds and let it cool before use. Then insert the needle into the injection port and slowly pull the plunger back until the syringe is full.

Conclusion

From my experience, making a liquid culture can be challenging at first, but with the right equipment it should not be a problem. The most important factors are sterile environment and starting with clean spores. If your spores are not clean, your liquid culture most likely will not be either.

Minimise your risk by working as sterile as possible at every step. Using the correct jars with injection ports and air exchange holes is equally crucial. Follow this guide closely and you will have a healthy, thriving liquid culture ready to use in no time.

How Do You Know When It Is Ready?

How Long Does The Colonisation Take?

Three modified mason jars displaying healthy, fully colonized white mushroom mycelium growing suspended in liquid culture broth.

The time it takes varies and depends on several different factors, but generally you can expect the process to take anywhere between 3 to 5 weeks. Generally, staying between 21 and 28°C (70 to 82°F) works well for most mushrooms, though depending on which variety you grow, it might differ slightly.

Another important aspect to consider is the strain itself. For instance, some strains colonise much quicker, like Golden Teacher or B+, while others like Penis Envy tend to take longer. Genetics also play an important role in colonisation speed. Even within the same strain, some mycelium can grow quicker due to better genetics.

Air exchange is another factor worth keeping in mind. With too little air exchange, growth will slow down significantly, since the mycelium needs fresh oxygen while also releasing built up CO2. So make sure your injection port and air exchange hole are not blocked and that your micropore tape or filter disk is still intact.

What Does a Healthy Liquid Culture Look Like?

Close-up of healthy, fluffy white mushroom mycelium suspended in a clear liquid culture jar, demonstrating good quality control free of contamination.

Before you use your liquid culture to inoculate a grain bag or all-in-one bag, I recommend checking it first to avoid any unnecessary contamination. As mentioned before, after 7 days you should be able to see the first signs of growth. Depending on your situation, it can sometimes take up to 14 days, so stay patient. It is also a good habit to note down the date you inoculated your jar, so you can keep track of progress and know when to expect results.

Start by simply looking at your LC. A healthy liquid culture should have a white, evenly spread cloud of mycelium throughout the solution. After breaking it up with your marble, you should see many small white clouds dispersed throughout the jar, rather than one dense clump sitting at the bottom. The liquid itself should be clear to slightly golden, with no unusual colours or odd smells. I will cover what a contaminated liquid culture looks like and how to detect it in a separate section further down.

After the visual check, it is a good idea to test your liquid culture on agar as a final confirmation. On an agar plate, contamination becomes much easier to spot after just a few days. Just make sure that the inoculation of the agar itself is done under sterile conditions, so you do not mistake contamination introduced during that step for a contaminated liquid culture.

For that I recommend the no pour agar tek, as it is beginner friendly and has a high success rate. You can make your own agar plates using our MEA mixture recipe, which you can find here.

How To Use Your Liquid Culture

Gloved hands using a liquid culture syringe to inoculate a sterilized grain spawn bag through a self-healing injection port.

You have several different options for how to use your liquid mycelium solution. You can inoculate agar plates, sterilised grain in the form of grain jars, grain bags, Uncle Ben's bags, or the very commonly used all-in-one bags. The process is usually very similar across all of these.

Sterile Environment: Make sure you are working in a sterile environment, like a still air box or in front of a laminar flow hood. Use gloves, a mask and 70% isopropyl alcohol to disinfect your workspace before you begin.
Sterilising the Injection Port: Wipe the injection port of your grain bag or jar with isopropyl alcohol and let it dry for a few seconds before inserting the needle. If you are reusing a needle, flame sterilise it for 10 to 15 seconds and let it cool before use.
Inoculate with LC: Shake your liquid culture syringe well before use to evenly distribute the mycelium. For agar plates, 1ml is sufficient. For grain jars, grain bags and all-in-one bags, use 3 to 5ml per bag or jar.
Store Properly: After inoculation, store your grain bags or jars at between 21 and 28°C (70 to 82°F) in a dark spot, away from direct sunlight, and wait for colonisation to begin.

Storage & Shelf Life

Optimal Storage Conditions

Fully colonized mushroom liquid culture jars and loaded syringes stored inside a refrigerator for optimal long-term preservation.

There is a difference between short term and long term storage. For short term storage, simply place your jars in a cool, dark place. For long term storage spanning several weeks to months, the approach is quite different.

The optimal conditions to keep your liquid culture alive for as long as possible are between 2 and 8°C (35 to 46°F) in the fridge, preferably in a dark spot. This will cause the mycelium to enter a hibernation-like state. The low temperatures slow down the mycelium's metabolism, causing it to consume fewer nutrients and less oxygen, while also producing less metabolic waste.

If you want to use your liquid culture again after refrigeration, take it out and let it sit at room temperature for a day or two before inoculating. This gives the mycelium time to wake up and recover, so it can better deal with potential contamination. It can take up to 2 to 3 days before the mycelium's metabolism is fully back to normal.

Here is what you should avoid when it comes to storage. First, avoid direct sunlight, as it can damage or dry out the mycelium and eventually kill it. It is also best to avoid extreme temperatures, both above 35°C (95°F) and below 0°C (32°F), as both will eventually kill the mycelium. Always keep in mind that mycelium is a living organism and needs to be treated with care.

Shelf Life

Shelf life depends heavily on storage conditions. Unlike spore syringes, liquid cultures cannot survive for years. However, under optimal conditions they can be stored for 3 to 6 months, and in some cases even up to 12 months in the fridge. There are also reports of mycelium surviving for over 1.5 years, though this should not be considered the norm.

Over time, the mycelium slowly starts to run out of nutrients and oxygen, since it is still a living organism. Metabolic byproducts produced by the mycelium also accumulate over time, which further shortens its shelf life. Eventually, if left long enough, this will cause the mycelium to die off.

Common Problems And Contamination

No Growth Visible?

Sterile liquid culture broth in a wide-mouth Mason jar with clear amber media and no visible mycelium growth or colonisation.

If you are not seeing any growth, here are the most common reasons:

Not enough time: Your LC may simply need more time. As mentioned before, it can take up to 14 days before the first signs of growth appear, so stay patient.
Temperature: If your jars are stored too cold or too warm, growth will slow down significantly or stop entirely. Make sure you are staying within 21 and 28°C (70 to 82°F).
Air exchange: Without proper air exchange, the mycelium will stall. Check that your filter disk or micropore tape is intact and not blocked.
Thin spore solution: If you used too little spore solution during inoculation, germination can take much longer or may not happen at all. Make sure to use 2 to 4ml per jar.
Spores are not viable: Old or poorly stored spores may simply not germinate. This is why testing your spores on agar first is always a good idea.
Contamination: Bacterial contamination in particular can suppress mycelium growth entirely, making it look like nothing is happening. Check for any unusual smell or cloudiness.
Wrong recipe: If your solution contains little to no nutrients, the mycelium has nothing to feed on. Always follow a tested recipe to avoid this.

How To Spot Contamination

Contaminated liquid culture jar showing green mold spots and dark bacterial patches competing with white mushroom mycelium.

There are 2 very common types of contamination in liquid cultures: bacterial contamination and mold contamination.

Here is how to spot a bacterial liquid culture:

Appearance: Cloudy or slimy texture
Growth: No visible mycelium growth
Smell: Sour or foul odour

Here is how to spot a moldy liquid culture:

Appearance: Green, black or yellow spots visible in the solution
Growth: Unusually quick growth within 12 to 24 hours (mycelium takes much longer)
Smell: Stale or musty odour

What should you do now? Sometimes it can happen that the mycelium outgrows and defeats the contamination. This is why I recommend waiting at least 7 days to see if the mycelium was able to fight back. If it did, great. If it did not, it is best to start over. Before you do though, make sure to figure out why it did not work out, so you can avoid the same mistake again.

Here are the most common reasons why a liquid culture gets contaminated. Most can be easily avoided:

Spores: Starting with unclean spores (most common)
Working environment: Not working in a sterile environment, including the needle
Sterilisation: The liquid solution was not properly sterilised
Filter: The filter disk is not working properly or was damaged

Common Beginner Mistakes

A troubleshooting checklist for mushroom cultivation, listing top 5 common liquid culture mistakes with items like wrong recipe, contaminated spores, and improper sterilization on a clipboard.

Here are the 5 most common beginner mistakes when making a LC at home:

Wrong recipe: Using the wrong recipe is one of the most common mistakes. Too many nutrients can actually promote bacterial growth, while too few will result in weak and slow mycelium. Stick to a proven recipe like this one to get the best results.
Not using a scale: Eyeballing your ingredients is a reliable way to mess up your ratios. This also causes too few or too many nutrients, leading to the same problems as point 1. A simple kitchen scale makes a big difference and removes all the guesswork.
Using spores without testing them first: Starting with unclean or untested spores is the most common reason a liquid culture fails. Always test your spores on agar first to confirm they are clean before committing them to a liquid culture.
Wrong sterilisation: Sterilising for too short a time leaves potential contaminants alive, while sterilising for too long can break down the nutrients in your solution. Always stick to the recommended times and pressure to get it right.
Lack of air exchange: This was actually my first mistake, and it caused my mycelium to suddenly stop growing. Without proper air exchange, CO2 builds up inside the jar and the mycelium suffocates. Always make sure your filter disk or micropore tape is intact and not blocked.

Honestly, do not get discouraged if your first liquid culture does not work out. My first LC stopped growing after a while and to this day I am not entirely sure why, but my best guess is that the air exchange was too low and I never bothered using a scale.

Two very avoidable mistakes in hindsight. Once you have an idea of what went wrong, the next one will be so much better. Most people nail it by their second or third attempt, so stick with it and do not give up.

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