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Mushroom Growing

Grow gourmet mushrooms on your counter. No sun needed.

3levels, ending in mushrooms from your own grows
25 mina Step, on average
$67to start Level 1
FreeLevel 1, always

Learn mushroom growing as a beginner

Mushrooms grow indoors with no sunlight and no garden. This beginner course starts with a grow kit so you learn what healthy growth looks like, then moves to growing oyster mushrooms on used coffee grounds and finally on pasteurized straw in a bucket you build, for three harvests in all.

The path

  1. 1
    Level 1Free

    Oysters at Home

    Harvests from a kit, coffee grounds and straw

    15 Steps, about 25 minutes each. Anyone curious about growing food indoors. No garden, sunlight or experience needed. Expect about $65 for a kit, grain spawn and supplies.

    1. Chapter 1: First flush. A grow kit fruited, mushrooms harvested and cooked, and a spore print made.
    2. Chapter 2: Coffee grounds. Used coffee grounds turned into a mushroom grow, colonized, and fruiting.
    3. Chapter 3: Straw bucket. Straw pasteurized, a bucket packed and colonized, and a mushroom dinner from your own harvest.
    1. 1
      Open your grow kit
      Your kit cut open, set in a good spot, and misted for the first time.

      A mushroom grow kit is a block of material, usually sawdust or straw, already fully colonized by mushroom mycelium. Mycelium is the living, root-like network of the fungus. The mushrooms you eat are its fruit, and they appear when conditions tell the mycelium it's time to reproduce.

      Oyster mushrooms are the easiest to grow at home. They grow fast and fruit reliably. Three things trigger fruiting: fresh air, high humidity, and a little light.

      The detail beginners miss is placement. The kit needs indirect light, like a kitchen counter away from a window, not direct sun. Direct sun dries it out. A spot near a heater or air vent does the same.

      Here's an example. Block checked: white and firm all over. Hands washed. A 2-inch X cut in the bag where the instructions say. Set on a counter in bright, indirect light, away from the radiator. Misted lightly around the cut. Phone reminder set for misting.

      Right is a kit in a bright spot with moist, white mycelium at the cut. Only eat mushrooms you grew from a kit or spawn you bought, and never forage wild mushrooms in this Era; many deadly species look like edible ones.

      Show your group
    2. 2
      Build a humidity tent
      A simple humidity tent over your kit, and a daily misting routine set up.
    3. 3
      Watch for pins
      Tiny mushroom pins spotted, and misting adjusted as they grow.
    See all 15 Steps
    1. 4
      Harvest your first flush
      Your first cluster of oyster mushrooms harvested at the right moment.
    2. 5
      Cook them and take a spore print
      Your harvest cooked, and a spore print taken from one cap.
      Show your group
    3. 6
      Gather for a coffee grow
      Fresh used coffee grounds collected, and a clean container and workspace ready.
    4. 7
      Mix and pack
      Grain spawn mixed into the grounds, packed into your container and set somewhere dark and warm.
    5. 8
      Check colonization
      Your coffee container checked for white mycelium and any signs of contamination.
    6. 9
      Soak the kit for a second flush
      Your first kit rested, soaked and back in its fruiting spot.
    7. 10
      Fruit your coffee grow
      Your fully colonized coffee container opened up to fruit, under a humidity tent.
      Show your group
    8. 11
      Pasteurize straw
      Chopped straw pasteurized in hot water, drained and cooled.
    9. 12
      Pack the bucket
      A bucket drilled, layered with straw and spawn, and set aside to colonize.
    10. 13
      Harvest flush two
      A second flush harvested from your kit or coffee grow, and cooked a new way.
    11. 14
      Check the bucket
      Your bucket checked for colonization and contamination, and readied to fruit.
    12. 15
      Bucket harvest and dinner
      Mushrooms harvested from your bucket and a mushroom dinner made to share.
      Show your group
  2. Level 2Unlocks after Level 1

    Grain and Jars

    Your own grain spawn and lion's mane

  3. Level 3Unlocks after Level 2

    Outdoor Beds

    Wine caps in the garden and shiitake logs

Where it ends: mushrooms from your own grows

Questions about learning mushroom growing

How long does it take to learn mushroom growing?

Level 1 is 15 Steps of about 25 minutes each, around 6 hours in all, split into 3 chapters. Go at your own speed: one Step a day, or a whole chapter in a sitting.

What do I need to start mushroom growing?

You'll need oyster mushroom grow kit, oyster mushroom grain spawn (about 2-3 lb), spray bottle, rubbing alcohol (70%), food-safe 5-gallon bucket with lid, straw (a small bale or a bag of pellets) and large pot and a thermometer. Expect to spend about $67 to start Level 1.

Can a complete beginner learn mushroom growing?

Anyone curious about growing food indoors. No garden, sunlight or experience needed. Expect about $65 for a kit, grain spawn and supplies.

What will I have made by the end of Level 1?

Three harvests of oyster mushrooms: from a kit, from used coffee grounds, and from a straw bucket you built.

Is this mushroom growing course free?

Yes. Level 1 of every hobby on Eras is free, and every Step links free lessons from great teachers online. Eras Plus is an optional subscription that opens the levels after it.

Free lessons in Oysters at Home come from North Spore, Zombie Mycology, GroCycle, Grow with soil, Low Impact, GrowVeg, Mushroom Appreciation, mushroom shed, Epic Gardening, The Old Farmer's Almanac Garden Planner, Chelsea Green Publishing. We link to their work and never copy it.

Cover photo by Tim Mossholder on Unsplash