How to Use a Liquid Culture and Substrate Starter Pack

Step 1: Prepare Your Work Area

Choose a clean room with as little airflow as possible.

Close nearby windows and doors, switch off fans and avoid working close to open bins, houseplants or food preparation areas.

Clean your work surface thoroughly, wash your hands and put on disposable gloves where available.

Wipe the injection port on the substrate bag with 70% isopropyl alcohol and allow it to dry.

Step 2: Prepare the Syringe

Shake the liquid culture syringe firmly for approximately 20 to 30 seconds. This helps distribute the mycelium throughout the liquid.

Attach the sterile needle without touching the needle or the syringe connection.

Remove the needle cover carefully and avoid allowing the needle to touch your hands, clothing or work surface.

Step 3: Inoculate the Substrate

Insert the needle through the centre of the self-healing injection port.

Inject the liquid culture slowly into the substrate. You can slightly change the angle of the needle while it remains inside the port to spread the culture across more than one area.

The amount required depends on the size of the substrate bag. In many cases, a small amount of liquid culture is sufficient. Using excessive liquid can make the substrate too wet and increase the risk of bacterial contamination.

Remove the needle carefully when finished. The injection port should close automatically.

Only inject through the designated injection port. Puncturing another part of the bag may allow contaminants to enter.

Step 4: Incubate the Bag

Place the inoculated bag somewhere clean and away from direct sunlight.

The ideal incubation temperature depends on the mushroom species, but ordinary indoor temperatures are suitable for many commonly cultivated varieties.

Do not place the bag directly on a radiator, heat mat or other strong heat source. The inside of the substrate can become warmer than the surrounding room.

During incubation, the mycelium should gradually spread through the substrate. It will often appear as white growth, although its exact appearance can vary between species.

Step 5: Monitor Colonisation

Check the bag periodically without opening it.

Healthy mycelium is commonly white, cream or slightly off-white. Some species grow quickly and evenly, while others develop more slowly or form thicker patches.

Possible warning signs include:

• Green, black, pink or orange growth

• Strong sour or rotten smells

• Excessive sliminess

• Large areas that remain wet and uncolonised

• Rapidly spreading growth with an unusual colour or texture

Some yellow or amber liquid may be produced by stressed mycelium and does not always mean the bag is contaminated. However, unusual colours or unpleasant smells should be treated cautiously.

Keep any suspicious bag sealed and separate it from your other growing projects.

Should You Mix the Bag?

Some substrates benefit from being gently mixed or broken up once the mycelium has established itself. This helps distribute the colonised material throughout the bag.

However, not every mushroom species or substrate should be handled in the same way. Check the cultivation recommendations for your particular culture before breaking up the block.

When mixing is recommended, wait until a noticeable portion of the substrate has colonised. Gently massage the unopened bag to distribute the mycelium, then return it to the incubation area.

Step 6: Wait for Full Colonisation

Allow the mycelium to spread throughout the entire substrate.

The block should normally appear mostly or completely colonised before fruiting conditions are introduced. Depending on the species, the block may also need additional time to mature or consolidate after it first appears fully colonised.

Colonisation can take anywhere from a few weeks to several months, depending on:

• The mushroom species

• The substrate

• The amount of culture used

• Incubation temperature

• Genetics

• The size and density of the block

Patience is important. Avoid opening the bag early simply because growth appears to have slowed.

Step 7: Introduce Fruiting Conditions

Once the substrate is fully colonised and mature, it can be moved into suitable fruiting conditions.

The precise requirements depend on the mushroom species, but most cultivated mushrooms require a combination of:

• Fresh air

• High humidity

• Indirect light

• A suitable temperature range

Some species fruit through cuts made in the bag, while others require the top of the bag to be opened or the colonised block to be removed.

Always check the fruiting method recommended for your particular mushroom culture before cutting or opening the bag.

Step 8: Harvest Your Mushrooms

Harvest timing varies between species.

As a general rule, mushrooms are best harvested while they are still firm and before they become overmature. Some varieties should be picked before their caps flatten completely, while others are ready when their caps have fully developed.

To harvest, gently twist and pull the mushroom cluster from the substrate or cut it cleanly near the base.

Remove any remaining stem material to help keep the block clean.

Growing Additional Flushes

Many colonised substrate blocks can produce more than one crop, known as a flush.

After harvesting, remove loose mushroom material and return the block to suitable fruiting conditions. Give it time to rest and maintain the humidity required by the species.

Later flushes may be smaller than the first, but a healthy block can often continue producing until its nutrients are exhausted.

Common Questions

How quickly should I see growth?

Some cultures show visible growth within several days, while others may take longer. Temperature, species, genetics and inoculation technique can all affect the speed of colonisation.

Should I use the entire syringe?

Not necessarily. The amount required depends on the substrate bag’s size and moisture content. More liquid culture does not always produce faster growth, and too much liquid may create overly wet conditions.

Does the bag need light during colonisation?

Most mushroom cultures do not require strong light while colonising. Keep the bag away from direct sunlight and excessive heat.

Should I open the bag to check it?

No. Keep the bag sealed throughout colonisation. Opening it before the substrate is fully colonised can introduce mould spores and bacteria.

Is condensation normal?

A small amount of condensation is often normal. Heavy pooling, sliminess or an unpleasant smell may indicate that the substrate is too wet or contaminated.

Final Tips

Cleanliness is one of the most important parts of mushroom cultivation. Prepare your workspace carefully, avoid touching sterile surfaces and keep the substrate bag sealed until it is ready to fruit.

Make sure the culture and substrate are suitable for one another, and remember that each mushroom species has its own preferred incubation and fruiting conditions.

Mushroom cultivation requires patience, but watching the mycelium spread through the substrate and produce its first mushrooms is well worth the wait.