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Shiitake Mushroom Grow Block Kit Instructions

Shiitake Mushroom Grow Block Kit 

Shiitake mushroom grow blockCongratulations, you are now the owner of a shiitake mushroom grow block. The “block” is composed mainly of hardwood sawdust and wood chips bound together with mushroom tissue or “mycelium” contained in a plastic bag. Mycelium is the white fluffy material covering the outside of the block. This will naturally turn brown as the block matures. The white mycelium is very delicate and you should avoid touching it as much as possible. When moving the block, hold onto the top and bottom to minimize damage. If you wish to delay the fruiting for a few days, place the block in the refrigerator without opening the bag.



  1. Carefully remove mushroom block and humidity tent from the box. DISCARD THE BOX.

  2. Cut the bag 1-inch above the block, and remove the top half of the bag.

  3. Place the bag inside the humidity tent. Fold and close the top of the tent with the binder clip. The humidity tent prevents rapid drying that will stunt or prevent growth.

  4. Locate a place where your block will receive indirect sunlight, and maintain temperatures between 60-80 degrees F.

  5. The block MUST be misted twice daily with non-chlorinated water, and thoroughly mist the inside of the humidity tent as well.
  6. The Shiitake block will take 4-8 weeks before you see mushrooms forming.  Maintaining consistent misting and temperatures is CRUCIAL to growth.
  7. As the block ages, it will turn brown and develop a hard skin.  Following this, mushroom primordia appear, which will become mushrooms.


Pick mushrooms as they mature, but before the cap edges curl upwards.  After all mushrooms have grown and been harvested, the block will go dormant for 2 weeks.  During this time, continue to mist daily.  The kit will produce 2-4 flushes. 


If you don't mist daily, your block will die.

If your mushrooms are too small, put a small fan in the room to give them more air to grow!  But do NOT aim directly at the mushrooms or they will dry out.

Adding a humidifier in the dry seasons of the year is recommended.

Everything Mushrooms – 1004 Sevier Ave. - Knoxville TN, 37920 865.234.0977 - http://everythingmushrooms.com