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August 3, 2021

The different stages of an Oyster mushroom grow

If you are growing one of our mini-farm (mushroom grow kits) here's some photos showing the different stages. This will help you know what to look for or what to expect.

The unique conditions of your mushroom 'grow' (usually in your home) will influence the speed and shape of your mushrooms as they develop. The following photos so how they should look like, and also some common problems

1. Incubation stage

For the first few weeks (generally 2 in summer and up to 4 in winter), the mycelium of the mushroom is growing within the substrate. The substrate we use is a mixture of Pine sawdust and soy hulls. In essence, we have created a rotting log which is what the mushroom would be growing on in nature

You should notice the mycelium thickening and getting white within the bag.

Early Growth

2. The Pinning Stage

This is the stage where the mushrooms start to fruit. It's called pinning because the little mushrooms sometimes look like little pinheads (called a pin set). Although, Oyster mushrooms often just looks like a blob (especially the pinks. At his stage, it's essential to crank up the humidity. Ideally, it'll be in the 90% relative humidity range. See our humidity tips page.

3. Mushroom growth after a few days

If all goes well, and you are providing good conditions, you should notice steady growth. For instance, if you check every 6 hours you should notice a difference. If the conditions are not good (and this is usually due to lack of humidity), it will stall.

4. Mushroom harvest

The Greys are easier than the Pinks for observing the changes that are taking place that indicate that they are ready to harvest. The caps on the Greys will flatten out and may start to curl or rise up (into a more convex shape) exposing their gills. It's at this stage they will drop their spore.

The Pinks will often grow with their gills fully exposed, so it's difficult to see the change like the Greys. So for the pinks, if they have been steadily growing we recommend harvesting on day 5. Once you have had a successful harvest, you should know what to look for and perhaps time the harvest better for next time.

we recommend picking them before they spore but if they do, carefully wipe up the spore with a damp cloth and harvest. They are still good to eat.

Things that can go wrong

a) Stalling

The number one thing that people contact us about, is the first harvest stalling. This is generally through a lack of humidity. Notice how the little pink pin-set has darkened (and will eventually turn black). If it stays this size and darkens, it's stalled. Stalling is usually more of a problem with the Pink oyster mushrooms.

b) Overdone (not harvested after 5 days)

Leaving the mushrooms growing for longer than 5 days means they are overdone. The flavour and quality will deteriorate quickly. You will also have a big spore mess to clean up. This can cause problems for people with allergies.

For the greys, notice how the edges have started to turn up exposing the gills.

The pinks are more difficult to tell as often grow with the gills exposed, some more care needs to be taken to harvest on day 5. The pinks will also deteriorate more quickly, they will start turning yellow and will give off a pungent smell.

c) Not enough air exchange.

If the mushrooms are grown in an enclosed space, they will grow long and leggy with undersized caps. This occurs due to a buildup of carbon dioxide (that the mushrooms exhale), so essentially stale air. The mushrooms will grow long stems trying to find better air. If this happens we often recommend cooking with them as you might with salt and pepper squid.

The stems in this example are thick, in some cases, they will be more skinny or wirery.

Further Reading

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