How to Grow Reishi Mushrooms at Home: A Step-by-Step Guide
How to Grow Reishi Mushrooms
Reishi is one of the most unusual and rewarding mushrooms you can cultivate at home. Instead of soft clusters like Oyster mushrooms, Reishi produces dense, woody fruiting bodies that can develop into spectacular antlers or glossy lacquered conks.
It is slower than many beginner species, but the growing process is surprisingly straightforward once you understand what it likes: healthy culture, sterile grain, hardwood-based substrate, warmth, humidity and patience.
What is Reishi?
Reishi is the common name given to a number of mushrooms within the Ganoderma group. They are wood-decaying fungi known for their dense fruiting bodies and distinctive lacquered appearance.
Depending on the strain and growing conditions, Reishi can develop as tall branching antlers or broaden into the more familiar shelf-like conk.
Red Reishi
The classic form, developing rich red, chestnut and amber tones as it matures.
Yellow Reishi
A striking Reishi capable of producing beautiful golden and yellow-toned fruiting bodies.
Black Reishi
A darker form with dramatic pigmentation and the same characteristic woody growth.
Hemlock Reishi
A beautiful Ganoderma associated naturally with hemlock and other coniferous woodland.
Antler Reishi
Particularly suited to producing dramatic upright and branching antler-style growth.
One basic method
Although their appearance differs, the cultivation process is broadly similar across Reishi varieties.
What you'll need
- Reishi liquid culture
- Sterilised grain bag or grain jar
- Hardwood-based fruiting substrate
- Sterile syringe and needle
- Alcohol wipes or 70% isopropyl alcohol
- A clean inoculation area
- Warm colonisation space
- Humid fruiting area with fresh-air exchange
The best substrate for Reishi
Reishi is a wood-loving mushroom, so hardwood is the natural choice.
A supplemented hardwood substrate provides both the structure and nutrition required to produce a strong fruiting block.
Hardwood sawdust
A traditional base material for cultivating wood-decaying mushroom species.
Hardwood pellets
Convenient and consistent when properly hydrated and sterilised.
Hardwood + bran
A nutrient-rich supplemented substrate and an excellent choice for producing Reishi fruiting blocks.
From culture to fruiting block
Inoculate your grain
Clean your work area thoroughly and wipe the injection port of your grain bag with alcohol.
Shake the liquid culture syringe well so the mycelium is evenly distributed, attach a sterile needle and inject a small amount through the self-healing injection port.
Let the grain colonise
Keep the bag somewhere warm, clean and out of direct sunlight. Healthy Reishi mycelium is normally bright white and can become extremely dense as it establishes itself.
Once roughly 20–30% of the grain has colonised, gently break up the colonised grains and redistribute them throughout the bag.
Then leave the bag alone and allow the mycelium to recover and finish colonising.
Transfer onto hardwood
When the grain is completely colonised, it can be distributed through a sterilised hardwood fruiting substrate.
Mix the grain spawn as evenly as possible through the substrate. This gives the Reishi mycelium many inoculation points and helps the block colonise more evenly.
What a colonised block should look like
As the Reishi spreads through the hardwood substrate it will bind the material together with dense white mycelium.
Healthy Reishi mycelium should appear white, vigorous and well established throughout the hardwood substrate.
Let the block mature
Once the block appears fully colonised, give the Reishi time to become well established before forcing it into fruiting.
A good block should feel firm and remain held together by the mycelial network.
Reishi is slower than many Oyster species, and waiting a little longer at this stage can produce a stronger fruiting block.
What Reishi needs to fruit
Keep conditions warm and reasonably stable.
Young fruiting bodies need a humid environment.
Airflow has a major effect on the final shape.
Ambient light helps normal growth and orientation.
Antlers or classic Reishi conks?
Reishi can produce dramatically different fruiting bodies depending largely on the amount of fresh-air exchange it receives.
Restricted fresh-air exchange encourages antler growth, while increased airflow encourages Reishi to broaden into traditional shelf-like conks.
Antler form
Higher carbon dioxide and more restricted airflow encourage long, upright finger-like growth.
Conk form
Increasing fresh-air exchange encourages the mushroom to broaden and produce its familiar lacquered cap.
You can influence it
Adjusting fresh air during development allows growers to steer the mushroom towards the form they prefer.
How should you fruit the block?
Avoid stripping all the plastic from the block. Keeping most of the bag in place helps the substrate retain moisture.
Top fruiting
Opening the top of the bag works particularly well when encouraging upright antler growth.
Controlled opening
A smaller targeted opening allows Reishi to emerge while keeping most of the block protected.
Avoid drying the block
Exposing too much substrate can cause unnecessary moisture loss during a long fruiting cycle.
How long does Reishi take?
Reishi isn't a mushroom to choose if you want the fastest possible harvest.
The exact timeline depends on your strain, temperature, substrate, spawn rate and growing environment.
Common Reishi growing problems
My block is taking forever
Reishi can simply be slow. Cooler conditions, low spawn rate, substrate density and strain differences can all influence speed.
The exposed surface is drying
Check humidity and avoid exposing more substrate than necessary. Fresh air is important, but strong dry airflow can dehydrate the surface.
It's growing strange antlers
This is usually completely normal. Elevated carbon dioxide can cause Reishi to grow into long antler-like structures.
I can see green mould
Green mould, black growth, strong sour smells, sliminess or rapidly spreading unusual colours are warning signs of contamination.
It's colonised but won't fruit
Check humidity, warmth, fresh air and the opening in the bag. The block may also simply need more time to mature.
Harvesting Reishi
Mature Reishi becomes considerably tougher than a normal culinary mushroom.
Once the fruiting body has reached the size and shape you want and active outward growth has slowed, it can be cut cleanly away from the substrate block.
Mature Reishi develops a dense woody texture and its distinctive lacquered red-brown surface.
Drying and storage
If drying your harvest, larger fruiting bodies can be sliced before dehydration. Dry them thoroughly before transferring them to an airtight container somewhere cool and dry.
Ready to grow Reishi?
Start with a healthy Reishi culture, establish it on sterile grain, then move it onto a nutrient-rich hardwood substrate.
Reishi growing questions
Can I grow Reishi on straw?
Hardwood-based substrate is generally a much better choice. Reishi naturally grows as a wood-decaying fungus and performs particularly well on supplemented hardwood.
Is Reishi suitable for beginners?
Yes. It is slower than Oyster mushrooms but the process itself is manageable, particularly when using pre-sterilised grain and hardwood substrate.
Why is my Reishi growing antlers?
Restricted fresh-air exchange and increased carbon dioxide tend to encourage upright antler growth. It is a normal growth form.
How do I encourage classic Reishi conks?
Increase fresh-air exchange while maintaining suitable humidity and warmth. This encourages the growing tips to broaden and form shelf-like caps.
Can Reishi grow in an all-in-one bag?
Yes, provided the fruiting substrate is suitable for a wood-decaying mushroom such as Reishi and has been properly prepared and sterilised.
Does Reishi need light?
It does not require strong sunlight, but some indirect ambient light is useful during fruiting.
Can I use an Artisan Mushrooms hardwood bag?
Yes. A sterilised hardwood-based substrate is an excellent choice for growing Reishi.
Reishi rewards patience
Reishi isn't the fastest mushroom you'll ever grow, but it might be one of the most interesting.
Start with clean culture, allow the grain to colonise properly, give the hardwood block enough time to establish itself and then use fresh-air exchange to influence the form you want.
Watching a patch of white mycelium eventually develop into a forest of branching antlers or a cluster of glossy lacquered conks is one of the more unusual and satisfying mushroom grows you can do at home.