Oyster Mushroom Block

(Genus pleurotus)

Congratulations on purchasing your very own mushroom grow kit! With this kit you’ll be able to  experience the satisfaction of growing mushrooms in your own home. The block you’ve purchased contains a mixture of locally sourced hardwood sawdust (either oak or alder) and 20%  wheat bran which has been hydrated and sterilized in our autoclaves for 6 hours. The block was then inoculated with spawn (the seed of the mushroom) and allowed to incubate in our warehouse until now. At this point the bag should be sealed and the block should be fully colonized with white mycelium (the body of the organism). With proper care and attention this block can produce multiple flushes of mushrooms to enjoy in your home. Please follow the guidelines below for setting up a proper fruiting  environment for your mushrooms. Keep in mind that your primary objective  during the fruiting period is to provide ample airflow while maintaining a high humidity environment.

Things You Will Need

  1. A cool  area to fruit the mushrooms (55-75F)
  2. A clean sharp knife or razor blade
  3. A humidity tent  (a plastic bag, tote, or container slightly larger  than the block with holes to allow air flow (bag provided))
  4. Fine mist spray bottle with chlorine free water        


  1. Inspect the bag. The bag should be sealed and free of mold or bacteria. Yellow liquid is a normal byproduct of digestion but presence of other colors (blue, green, or black) may indicate a contamination.
  2.  Use a clean sharp knife to cut an X  in the position indicated on the bag. Be careful not to damage the mycelium while doing this. Pull the bag away from the block while cutting if necessary.
  3. Place the humidity tent (bag, tote, etc.) over the top of the block and puncture it multiple times with a clean sharp blade.  Make sure the holes are wide enough to allow air to flow through.
  1. Mist the surface of the block at the X and the inside of the humidity tent 2-3 times daily with chlorine free water to avoid drying out.  
  1. Once mushrooms appear they should take 3-10 days to grow and ripen. Continue to mist the inside of the humidity tent as they grow, but avoid spraying the mushrooms directly. When ready (caps are beginning to curve upward), remove the mushrooms by gently holding the base and turning or simply cutting off with a clean sharp knife.
  2. Once fruited the block can be placed in a warm (70-80f) dark area to incubate further. After at least 7 days repeat the process above to encourage growth of additional mushrooms.

Ash Tree Farms

5305 NE 121st Ave, Vancouver Wa. 98682

AshTreeFarms@gmail.com www.ashtreefarms.com