Liquid culture and spore syringes look similar, they come in the same 10ml syringes and plenty of people use the names as if they mean the same thing. They don’t. One is full of spores waiting to wake up and the other is full of living mycelium that’s already got going. Knowing the difference will save you time, money and the odd contaminated bag.
Here’s our updated guide to what each one is, how to tell them apart and which one is right for your next project.
What is a spore syringe?
A spore syringe is simply sterile water with mushroom spores suspended in it. Spores are the mushroom version of seeds, only far smaller. A single spore is around 10 to 15 microns long, which is about a hundredth of a millimetre, so the bits you can see floating in the syringe are clumps of thousands of them.
Look closely and you’ll usually spot dark specks drifting about in clear water. How many you can see depends on the strain. Dark spored mushrooms such as Golden Teacher show up easily, while albino and leucistic strains have pale spores that can be almost invisible. Don’t panic if yours looks nearly empty. Pop a drop under a microscope at 400x and you’ll find they’re there.
What is liquid culture?
Liquid culture, or LC, is a nutrient broth, usually water with a little light malt extract, honey or dextrose, with living mycelium growing in it. Instead of spores you’re getting the living body of the mushroom, already awake and feeding.
A healthy LC syringe looks quite different. The liquid is usually a light golden or cream colour, and inside you’ll see wispy white clouds or little clumps of mycelium. Give it a gentle swirl and they’ll break up and drift around.
The key differences at a glance
| Spore syringe | Liquid culture | |
|---|---|---|
| What’s inside | Spores in sterile water | Living mycelium in a nutrient broth |
| Looks like | Clear water with dark or pale specks | Golden or cream liquid with wispy white clumps |
| Speed | Slower, as the spores need to germinate first | Faster, often days quicker to colonise grain |
| Genetics | Every spore is unique, so results vary | Usually started from a selected culture, so results are more consistent |
| Shelf life | Often 6 to 12 months in the fridge | Best used within 2 to 3 months, kept in the fridge |
| Spotting contamination | Fairly easy, as cloudy water is a warning sign | Harder, as healthy LC is already cloudy |
| Best for | Microscopy, storage and collecting strains | Growing gourmet and medicinal mushrooms |
Why growers love liquid culture
For gourmet growing, LC is hard to beat. Because the mycelium is already alive, it gets a head start the moment it hits your grain or grow bag. Colonisation is quicker, which gives contaminants less time to sneak in, and you get far more predictable results because you’re not relying on the genetic lucky dip that comes with spores.
That’s why our gourmet liquid cultures are the go to for anyone inoculating an all in one grow bag or a bag of grain spawn. We stock lion’s mane, oysters in just about every colour, shiitake, reishi, turkey tail, cordyceps and more.
The downsides of liquid culture
- Shorter shelf life. LC is alive and hungry. Kept in the fridge it’s best used within two to three months, while a spore syringe can sit happily for a lot longer.
- Contamination is harder to spot. In a spore syringe, cloudy water is an instant red flag. Healthy LC is meant to look a bit cloudy, so you need to watch for other signs, like the whole liquid turning evenly milky or murky instead of having distinct clumps, a slimy texture or a grey, green or pink tinge.
- It needs a little care. Give it a gentle swirl every so often to stop the mycelium clumping up. Swirl it, don’t shake it like a cocktail.
Why spore syringes still have their place
- Microscopy. If you want to study spores under the microscope, you need spores. Simple as that.
- Long term storage. Spores are dormant, so they keep far longer and are ideal for building up a collection of strains.
- Variety. There are many more strains available as spores than as cultures.
A note on magic mushroom strains
In the UK you’ll only ever find psilocybin species such as Golden Teacher, B+ or Penis Envy sold as spore syringes or swabs, never as liquid culture. That’s because LC contains living mycelium, and growing mycelium from those species is illegal here. Spores contain no controlled substances and are legal to buy for microscopy and research. Our spore syringes are sold on exactly that basis, to over 18s only.
Can I make my own liquid culture?
You can, and with gourmet species it’s a really satisfying next step. The usual recipe is around 4g of light malt extract per 100ml of water, in a jar fitted with a self healing injection port and a filter. Pressure cook it at 15 PSI for around 20 minutes, let it cool completely, then add a few drops of gourmet LC or spores in front of a flow hood or inside a still air box. After a couple of weeks you’ll have a whole jar of culture from a single syringe. It’s a lovely way to stretch your cultures further, as long as your sterile technique is spot on.
Matching each one to your grow
How you plan to use it matters just as much as what’s in the syringe.
- All in one grow bags. Liquid culture is the natural partner. It colonises the grain quickly and evenly, so the bag has less time to pick up anything nasty. Inject 3 to 5ml through the port and you’re away. Our all in one grow bag guide takes you through it from start to harvest.
- Grain spawn jars and bags. Again, liquid culture wins on speed, and one 10ml syringe will happily do several jars.
- Microscopy. If you’re studying magic mushroom spores, a spore syringe or swab is all you need. Remember these are for microscopy only, as germinating them is illegal in the UK.
So which should you choose?
- Growing gourmet or medicinal mushrooms? Go for liquid culture. It’s quicker, more reliable and kinder to beginners.
- Into microscopy or collecting strains? Spore syringes are what you’re after.
- Stocking up to use later? Spores store better, so they’re the safer bet.
Whichever you pick, buy from a supplier who checks their syringes before they go out. Ours are all covered by our Lifetime Grow Guarantee, so if a culture or syringe isn’t viable or turns out to be contaminated, we’ll replace it.
Not sure where to start? Our guide to inoculating an all in one grow bag walks you through your first grow step by step.
Frequently asked questions
Can you see spores in a spore syringe?
Sometimes. Dark spored strains show up as specks, but pale spores can be almost invisible. You need around 400x magnification to see individual spores.
How long does liquid culture last?
Kept in the fridge, it is best used within 2 to 3 months.
Is liquid culture faster than spores?
Yes. The mycelium is already growing, so it usually colonises grain or a grow bag noticeably quicker.
Can I buy magic mushroom liquid culture in the UK?
No. Growing mycelium from psilocybin species is illegal, so those strains are only sold legally as spores for microscopy.
