Mushroom Growing
Grow gourmet mushrooms on your counter. No sun needed.
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
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.
- Chapter 1: First flush. A grow kit fruited, mushrooms harvested and cooked, and a spore print made.
- Chapter 2: Coffee grounds. Used coffee grounds turned into a mushroom grow, colonized, and fruiting.
- Chapter 3: Straw bucket. Straw pasteurized, a bucket packed and colonized, and a mushroom dinner from your own harvest.
- 1Show your groupOpen your grow kitYour 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.
- 2Build a humidity tentA simple humidity tent over your kit, and a daily misting routine set up.
- 3
See all 15 Steps
- 4Harvest your first flushYour first cluster of oyster mushrooms harvested at the right moment.
- 5Show your group
- 6Gather for a coffee growFresh used coffee grounds collected, and a clean container and workspace ready.
- 7Mix and packGrain spawn mixed into the grounds, packed into your container and set somewhere dark and warm.
- 8Check colonizationYour coffee container checked for white mycelium and any signs of contamination.
- 9Soak the kit for a second flushYour first kit rested, soaked and back in its fruiting spot.
- 10Show your groupFruit your coffee growYour fully colonized coffee container opened up to fruit, under a humidity tent.
- 11
- 12Pack the bucketA bucket drilled, layered with straw and spawn, and set aside to colonize.
- 13Harvest flush twoA second flush harvested from your kit or coffee grow, and cooked a new way.
- 14Check the bucketYour bucket checked for colonization and contamination, and readied to fruit.
- 15Show your groupBucket harvest and dinnerMushrooms harvested from your bucket and a mushroom dinner made to share.
Level 2Unlocks after Level 1 Grain and Jars
Your own grain spawn and lion's mane
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