Grow King Oyster Mushrooms At Home

King oyster mushrooms (Pleurotus eryngii) are a delicious and meaty variety of mushrooms that can be grown at home. Here's a basic guide on how to grow king oyster mushrooms:

1. Obtain mushroom spawn or a kit:

  • You can purchase king oyster mushroom spawn from a reputable supplier, or you can start with a grow kit that contains all the necessary materials.

2. Choose a growing medium:

  • King oyster mushrooms can be grown on various substrates, but they are commonly grown on a mixture of hardwood sawdust and straw. You can purchase pre-made substrate bags or prepare your own.

3. Sterilize the substrate:

  • Sterilize the substrate to kill off any competing microorganisms. You can do this by boiling, pressure cooking, or using other sterilization methods. Allow it to cool to room temperature.

4. Inoculate the substrate:

  • Once the substrate is cool, mix it with the mushroom spawn. You can crumble the spawn into small pieces and evenly distribute it throughout the substrate. The inoculated substrate should be tightly packed into containers like bags or trays.

5. Incubation:

  • Place the inoculated substrate in a dark, warm (75-80°F or 24-27°C), and humid environment. Keep the substrate moist but not waterlogged. This is the colonization phase, and it can take several weeks for the mycelium to spread through the substrate.

6. Initiate fruiting conditions:

  • After the mycelium has colonized the substrate, induce fruiting conditions by exposing it to cooler temperatures (around 55-65°F or 13-18°C) and increased humidity. You can achieve this by misting the substrate and maintaining high humidity levels in a fruiting chamber or greenhouse.

7. Provide light:

  • While king oyster mushrooms don't require as much light as some other mushrooms, providing them with indirect natural or artificial light can help stimulate fruiting. A few hours of light per day is generally sufficient.

8. Maintain humidity:

  • Keep the humidity levels high (around 90%) in the fruiting chamber to encourage mushroom development. Regular misting can help maintain humidity.

9. Harvesting:

  • King oyster mushrooms will develop as elongated, cylindrical mushrooms with a white stem and brown cap. Harvest them when the caps are still closed or slightly open. Use a clean, sharp knife to cut them at the base of the stem.

10. Repeat or recycle:

  • After harvesting, you can allow the substrate to rest and potentially produce more flushes of mushrooms. Alternatively, you can use the spent substrate as a base for growing other mushrooms or for composting.

Remember to maintain cleanliness and proper sanitation throughout the growing process to minimize the risk of contamination. Growing mushrooms at home can be a fun and rewarding hobby, but it may take some practice to perfect your technique.


We have an assortment of All-In-One Mushroom Grow Bags aka "Fun Bags' for your growing pleasure. Fun bags are literally a window into how mother nature produces mushrooms right inside the bag. 

Our fun bags are a great family or school project. Teach kids how to grow their own mushrooms and they will never go hungry. No yard needed. Grow right indoors from beginning until harvest. Bags can also be grown outdoors. 

These bags to not contain spores or liquid culture. Inoculate with your favorite mushroom spores or liquid culture. 

If you have any questions or need advice please contact us.