Agar, Liquid Culture and Mycology Lab Supplies
Agar is where you get control. Working on plates lets you isolate a clean culture from a contaminated one, select the fastest-growing genetics from a spore print, and keep a strain alive indefinitely instead of buying a new syringe every grow. It is the step that separates people who grow mushrooms from people who culture them - and the equipment cost is genuinely small.
What you need to work with agar
- Agar medium - pre-mixed powders are simplest. MEA (malt extract agar) is the general-purpose standard; PDA (potato dextrose agar) is close behind.
- A still air box. A clear tote with arm holes. It works by removing air currents rather than filtering them, and for plate work and grain inoculation it is genuinely sufficient.
- Scalpel and flame. Sterilize the blade, cut a wedge of clean mycelium, transfer to a fresh plate.
- Pressure sterilizer to sterilize the medium before pouring - or buy pre-poured sterile plates and skip it.
- Liquid culture - a sterile sugar solution you grow mycelium in, then inject into grain. Faster colonisation than spores because it is already mycelium.
Agar vs liquid culture vs spores
| Start from | Speed | Contamination visible? |
|---|---|---|
| Spore syringe | Slowest - has to germinate | No - you find out in the grain |
| Liquid culture | Fast - already mycelium | Partly - cloudiness and smell |
| Agar plate | Fast, and you choose the genetics | Yes - you can see everything |
That last column is the argument for agar. On a plate, contamination is visible before it reaches your grain. In a syringe it is not.
What to skip
- Buying a flow hood first. A still air box costs a fraction and handles everything up to commercial volume.
- Pouring plates in open room air. Even mild air currents carry contaminant spores directly onto the medium.
- Working from spore syringes indefinitely. If you like a strain, get it onto agar and keep it.
Frequently asked questions
What agar is best for growing mushrooms?
Malt extract agar (MEA) for general use. Pre-mixed powders remove the measuring, and pre-poured sterile plates remove the sterilizing too.
Do I need a still air box or a flow hood?
A still air box for hobby and small commercial scale - it is far cheaper and works well for plate transfers and grain inoculation. Flow hoods matter at volume.
What is liquid culture?
Mycelium grown in a sterile sugar solution, injected into grain. It colonises faster than spores because germination has already happened.
How long do agar plates last?
Several months refrigerated and sealed. Slants last longer still, which is why they are the standard for long-term strain storage.
