Learn To Grow Mushrooms



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Here is a brief tutorial for growing
Oyster Mushrooms at home.


0yster mushrooms are a gourmet mushroom that is easy to grow in your own home. The most commonly cultivated oyster mushroom is Pleurotus ostreatus. For cultivation at home, wheat straw makes an excellent substrate.




Substrate is the medium on which the cultivated mycelium grows.

Mycelium is the mushroom “plant.” The part you eat is the fruit.

Spawn is grain on which the mycelium is growing.

Inoculation is the act of adding spawn to the substrate.

Incubation is the period during which the spawn colonizes the substrate.

Fruiting is the appearing of the mushrooms.



Preparing the Substrate


Straw is a great substrate for growing Oyster Mushrooms. The straw has to be shredded in order to allow for faster mycelium colonization.


You can shred the straw using power tools or you can buy already shredded straw and save yourself a lot of headache.


Pasteurization of the Substrate


The shredded straw must be pasteurized in hot water at 160°F for 40 minutes. Simply place the straw in a container and add hot water. Then wait for 40 minutes, drain and let the straw cool to room temperature. Larger quantities can be pasteurized in large steel drums.

Inoculate the Substrate


Once the straw cools down to room temperature, you can start inoculating the straw with the grain spawn. You should add grain spawn in the amount of 10% of the dry weight of the straw.

You have to mix the spawn into the substrate until evenly distributed. Then, pack the inoculated straw tightly into clear plastic bags. Once the bag is full, tie the top with a wire. Do not forget to punch holes in the bag using a clean nail. You should space the holes every 3-4 inches apart.




Incubation is done in a dark room at the temperature between 70°F and 75°F until the straw is fully colonized. The mycelium will be clearly visible as a white substance running throughout the bag. It should take about 20 to 30 days to fully colonize the bag.


After the bag is fully colonized, you have to cold-shock the mycelium to start the fruiting cycle. To do this, simply place the bags in a refrigerator for 1 day. If the bag does not fit your refrigerator, you have to use a portable air conditioner in a closed room.


After the cold shock, place the bag in an area with an temperature of about 70°F to 73°F.


Taking Care of the Fruiting Bag


The fruiting bag has to be exposed to a relatively high humidity during the whole fruiting cycle. It would be a good idea to use a clear plastic bag and create a tent over the fruiting bag.


In about 10 days you will notice small mushroom pins on the surface of the substrate, under the plastic bag. You must keep the humidity high, close to 70%-85%. Keep misting with clean water several times a day. 

The mushrooms will grow through the holes you made with the nail. When the mushrooms get to approximately 1.5" - 2" in diameter, they can be harvested. 

The first flush will generate the most mushrooms. After you pick all the mushrooms, leave the bag under the tent and continue to mist.  After about 10-14 days there will be another flush.  The bag may fruit three to four times. 


After the last flush, you can recycle the contents of the bag, because spent substrate makes a great compost for plants.

Check out our selection of substrates, additives and mushroom cultures and start growing your own mushrooms today! We can even create a custom mushroom kit for you that produces 3-4 pounds of delicious mushrooms. Ask us now.












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