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Each species of mushroom is a different growing experience. Even if you have grown mushrooms before, please read the instructions for your kit carefully before proceeding. If you run into any problems please see our FAQ.

Step 4: Initiating Fruiting King Oyster

Undo the twist tie and make some space in the bag for your mushrooms to grow.

Use clips to close the top of the bag

Step 5: Fresh Air Exchange

King Oyster Mushrooms prefer to grow in an environment with 80-90% humidity. Because of this, you'll need to gently mist your kit regularly with a clean spray bottle. Fresh air exchange is also important for mushroom formation and growth. You want to create a humid environment for the mushrooms and to keep their bodies moist, rather than to 'water' them as you would a plant. Because you will begin growing your mushrooms inside of the growing bag, you will need to add some fresh air to your kit regularly.

  • Twice a day, open the top of the bag for 30 seconds to let in fresh air and spray generously.​​​

Step 6: Pinning

'Pinning' should begin within 1 -5 weeks of initiating fruiting. If you haven't seen any pinning after 5 weeks please see out FAQ. Once they have begun to pin, keep your mushrooms moist by misting them several times per day. You should also increase the fresh air exchange by opening the top of the bag.

Step 7: Harvest

Harvest your mushrooms before the edges begin to either flip up or to wrinkle, darken and split. A white dust under your mushrooms means they have started to drop spores. Your mushrooms will be at their most tender if you harvest them before they sporate, but they'll still be perfectly delicious if you don't quite catch them in time.


  • When your mushrooms have reached the desired size, harvest all of your mushrooms at once rather than one at a time. To harvest, twist and pull each mushrooms off at the base. Do not cut them as leaving the stem attached to the block of growing medium can inhibit the growth of your mycelium.

Step 8: Initiating The Next Flush

Did you know that your box has the ability to produce several clusters or 'flushes' of mushrooms over time?


Return your kit to your chosen location and repeat steps 5-7. Times between flushes can vary from 3-9 weeks, so be patient and don't forget to keep the humidity up by misting. Your kit may flush several times, but the amount of mushrooms will reduce with each flush and the time between flushes will increase.

Step 9: What to do with your kit when it stops producing mushrooms

Did you know that fungi play a key role in storing carbon? Trees and plants remove carbon from the atmosphere and fungi break down plant waste to create new carbon-rich soil. Clean air, healthy soil and delicious mushrooms: just one of the many ways fungi are incredible!

Once your block has finished flushing, Once your block has finished flushing, you can compost the block and dispose of the fruiting bag in general waste.


We hope you've enjoyed growing your King Oyster Mushrooms mushrooms!

We're passionate about sharing the diversity of the fungi kingdom & making more  of its edible & medicinal delights easy to grow. Want to try another strain or learn how to cultivate mushrooms? See our full range of mushroom growing kits and cultivation workshops!

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