How to Grow Reishi Mushrooms, Harvest Your Own Medicine
How to Grow Reishi Mushrooms, Harvest Your Own Medicine

How to Grow Reishi Mushrooms, Harvest Your Own Medicine


Reishi mushrooms grow on dead hardwood trees in nature, and they are a very woody, strong fruits. They are polypore mushrooms, releasing their spores from pores rather than gills. Also known as “mushroom of immortality”, Reishi boast a wide range of health benefits. For controlled indoor growing we are going to start with liquid culture to grain spawn and fruit on hardwood in grow bags. How do you grow Reishi?

This article contains affiliate links to supplies I use.

Steps For Growing Reishi

  1. Prepare grains for spawn
  2. Inoculate spawn
  3. Prepare bulk substrate
  4. Inoculate bulk substrate
  5. Fruit Reishi

Preparing Grain Spawn

  • 1 quart raw rye berries
  • 3 one-quart mason jars
  • Three jar lids with holes in the middle, taped with micro-pore tape
  • Strainer/screen
  • Large pressure cooker [order here]
  1. Wash your rye berries under hot water until the water runs clear and all foreign objects are removed. (5-6 washes)
  2. Fill pot with enough hot water to cover the berries, cover and let soak for 12 hours.
  3. Place pot on high heat until it boils, lower heat and simmer for 10-12 minutes. The berries are done when the middle comes out clear if you squeeze it.
  4. Strain the berries and lay out to dry, a screen or pizza peel works well for this, drying will take about 45 minutes.
  5. Now we will fill our three jars about 2/3rd full.
  6. Seal the jars with the modified lids and load them into the pressure cooker with recommended amount of water. (check pressure cooker directions)
  7. Pressure cook at 15psi for 90 minutes, then let pressure decrease naturally.
  8. Remove the jars from the pressure cooker and allow them to cool.
  9. Move on to inoculation.
Reishi Antlers

The Reishi antlers will begin to form conks when allowed more gas exchange.

Inoculate Grain Spawn

  • SAB [still air box]
  • Reishi LC [liquid culture] syringe
  • Prepared grain jars
  • Torch
  • Micro-pore tape
  1. Set SAB up with grain jars and tape inside.
  2. Torch the needle of your syringe outside the SAB for sterilization.
  3. Using steady efficient movements inoculate a grain jar with 1cc through the hole in the lid.
  4. Tape over the hole from inoculation.
  5. Repeat steps 2-4 for each remaining grain jar.
  6. Set jars in a dark place until completely colonized. Prepare your bulk substrate when the jars are 80% colonized.

Prepare Bulk Substrate

  • Large autoclavable grow bags
  • 15 cups dry hardwood pellets [must be hardwood]
  • 18 cups warm water
  • 3.5 cups wheat bran
  • Pressure cooker
  1. Add water to hardwood pellets, this will cause them to swell and fall apart.
  2. Add wheat bran to mixture and mix thoroughly.
  3. Scoop 4.25lbs into each grow bag, careful to keep filter patch clean.
  4. Fold the bags shut (should lay flat) and load them into pressure cooker with recommended water.
  5. Cook at 15psi for 2 hours then let pressure lower naturally.
  6. Remove bags from pressure cooker and allow them to cool, once completely cool move on to inoculation.
Reishi fruiting block growing antlers.

Inoculate Bulk Substrate

  • SAB [still air box]
  • 3 fully colonized grain jars
  • 3 prepared substrate blocks
  • Strong string [for tying bags shut]
  1. Set up SAB with one jar and one substrate bag inside. (shake grain jar first to knock grains loose)
  2. Using steady, efficient movements unfold the bag and open the grain jar. Pour the grains into the substrate bag and immedietly tie it shut.
  3. Using you hands carefully mix the grain spawn around in the substrate.
  4. Repeat steps 1-3 for each grain bag
  5. Allow blocks to fully colonize then move on to fruiting the Reishi.

Fruiting Reishi

  • Fully colonized substrate blocks
  • Scissors
  1. Reishi mushrooms will begin to for antlers as soon as the substrate is fully colonized. Antlers grow in low Co2 environments.
  2. When antlers are 2-3 inches tall cut the top of the bag open, this will initiate the creation of conks at the ends of antlers.
  3. Once the conks are a good size they are ready to pick. A single five pound block will yield about .5lbs of fresh Reishi. This Tek should yield about 1.5lbs.
  4. Enjoy your homegrown medicine!!!
Red Reishi antlers beginning to conk


  • Hardwood fuel pellets are an affordable option that work great.
  • Reishi grows fast, be careful not to let your grains sit for too long or it will be hard to break them up.
  • Increase humidity and lower temperature to 65F for fruiting
  • This Tek teaches how to grow Reishi from liquid culture
  • Order an LC syringe from a trusted vendor, like Root Mushroom Farms