Growing mushrooms is not like growing plants. In fact, fungi are more closely related to humans than plants. As a beginner, it is crucial to familiarise yourself with the quirks and oddities of mushrooms, so that you can grow both smarter and better.


The Waiting Game

When growing mushrooms, it can be hard to resist the urge to check your kit or grain spawn every five minutes. It’s exciting! However, patience is key to success. 

Most of the time, you can expect to see the first signs of colonisation after 5 days. However, don’t be disheartened if you don’t see the white stuff as soon as this. Colonisation can take up to 2 or 3 weeks to begin. This is especially true when using spores to inoculate grain spawn. Be patient and the results will come.

If you have to wait longer than 3 weeks, there is probably an issue that needs addressing. Reach out to a member of our team to see how we can help.

Stalled or Slow Growth

If you are experiencing slow growth, try moving your kit or grain spawn to a warmer spot in the house. Ideally above 21°C. However, try not to exceed temperatures above 26°C as this promotes the growth of other competitive moulds or bacteria, which is definitely no bueno.


Mycelium will produce its own heat as it grows. Therefore, the inside of the substrate will usually be a few degrees higher than the ambient room temperature. This temperature differential may cause some light condensation to build up inside the grow kit or grain spawn, but don’t worry this is normal and healthy as the mycelium develops.

However, pooling of water or sludgy looking substrate may be a sign of contamination. See the point below for more detail on contamination and how to spot it.

Non-White Growth

Sometimes, mature mycelium will turn a creamy yellow colour as it releases metabolites. This is most common at higher incubation temperatures, so try and keep things a little cooler.

Blue, black, green or red growth is usually a sign of bacterial or fungal contamination. Bad smells are also a sure sign that there is a contamination within the substrate. Contamination is the bane of all mushroom growers. Sadly, once it has taken hold it can be very difficult to treat. Your kit or grain spawn must be disposed of if contaminated. 

Blue Bruising

Not to be confused with contamination. Mycelium can take on a blue colouration when bruised. This is usually not an issue, just limit the touching or moving of your kit or grain spawn. The mycelium will recover pretty rapidly.

If you see blue colouration during fruiting or when spawning your grain, a simple way to check for bruising is with the Q-Tip or cotton swab test. Simply dab the cotton swab onto the blue coloured area lightly, and inspect the tip of the swab. If the swab is clean, the mycelium is bruised. If there is colour on the swab, this is due to mould spores and you should dispose of your kit or spawn.

Mushroom Fruiting

The fruiting and yield of your mushrooms will depend mostly on its genetics. You may get all your mushrooms growing in uniform crops or ‘flushes’. Or, they may grow more sporadically. If they grow sporadically, pick them as they mature. If they grow in uniform flushes, pick all the mushrooms at once and then prep for subsequent flushes.

After you have harvested your first flush, you may notice the substrate is starting to look dry. Using a fine mister or spray bottle, mist heavily directly onto the substrate to rehydrate it.

We hope you have found these tips and tricks useful. If you have a question that was not covered here, please do not hesitate to reach out to a member of our team.