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.
Reishi is slower than many beginner species, but it is surprisingly straightforward when you give it a clean culture, a hardwood-based food source, warmth, humidity and time. For home growers, the simplest method is to use a ready-sterilised all-in-one hardwood grow bag.
Easiest method for beginnersWhat 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.
The easiest way to grow Reishi at home
If you want the least complicated route, use a ready-sterilised all-in-one hardwood grow bag. It combines the grain and supplemented hardwood substrate in one bag, so there is no separate grain-to-substrate transfer to perform.
Method 1 — All-in-One Hardwood Grow Bag
This is the easiest method for most home growers. Inject your Reishi liquid culture through the self-healing injection port, allow the grain section to colonise, mix the colonised grain through the hardwood substrate, then allow the whole block to finish colonising before fruiting.
Best for: beginners, home growers and anyone who wants to avoid sterile transfers.
Method 2 — Grain Spawn → Hardwood Substrate
The traditional route is to inoculate sterile grain first, let it fully colonise, then transfer that grain spawn into a separate sterilised hardwood fruiting substrate. It gives you more control, but requires an additional transfer and therefore more careful sterile technique.
Best for: growers who already make grain spawn or want to scale up.
What you'll need
For the easiest all-in-one method
- Reishi liquid culture
- All-in-one hardwood grow bag with injection port
- Sterile syringe and needle
- Alcohol wipes or 70% isopropyl alcohol
- A clean inoculation area
- Warm colonisation space
- Humid fruiting area
- Fresh-air exchange during fruiting
If using the traditional two-stage method
- Reishi liquid culture
- Sterilised grain bag or grain jar
- Sterilised hardwood-based fruiting substrate
- A clean area for the grain-to-substrate transfer
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.
Method 1 — Using an all-in-one hardwood grow bag
This is the route we recommend for most first-time Reishi growers because the grain and hardwood substrate are already prepared and sterilised in one bag.
Inoculate the grain section
Clean your work area and your hands, then wipe the self-healing injection port with alcohol. Shake the Reishi liquid culture syringe so the mycelium is distributed through the liquid, attach a sterile needle and inject through the port into the grain section of the bag.
Let the grain colonise
Keep the bag somewhere warm, clean and out of direct sunlight. Reishi mycelium is usually bright white and can become very dense as it establishes itself.
Allow the mycelium to spread through a good portion of the grain before mixing. Exact speed varies with temperature, culture vigour and the size of the bag, so judge the bag by visible healthy growth rather than by a fixed number of days.
Mix the colonised grain through the hardwood
Once the grain section is well colonised, break it up from outside the sealed bag and mix the colonised grain evenly through the hardwood substrate. This creates many inoculation points throughout the block and helps the Reishi colonise the substrate more evenly.
After mixing, reshape the substrate into a compact block and leave the bag closed while the mycelium recovers and spreads through the hardwood.
Allow the full block to colonise
Leave the bag undisturbed until the hardwood block is strongly colonised with dense white Reishi mycelium. Do not rush into fruiting while large areas of substrate are still uncolonised.
Method 2 — Separate grain and hardwood substrate
If you prefer the traditional two-stage method, inoculate a sterile grain bag or jar with Reishi liquid culture first. Let the grain colonise fully, then transfer the colonised grain spawn into a separately sterilised hardwood-based fruiting substrate using clean sterile technique.
Inoculate grain
Inject Reishi liquid culture through the self-healing port of a sterile grain bag or jar.
Colonise fully
Allow the Reishi mycelium to spread through the grain until the spawn is healthy and fully colonised.
Transfer to hardwood
Mix the colonised grain through sterile hardwood substrate, then allow the resulting block to colonise before fruiting.
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. For the simplest beginner route, use Reishi liquid culture with a ready-sterilised all-in-one hardwood grow bag so there is no separate grain-to-substrate transfer.
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. In fact, a properly prepared all-in-one hardwood grow bag is one of the easiest ways to grow Reishi at home. The grain and hardwood substrate are already contained in the same sterile bag: inoculate the grain section, allow it to colonise, mix it through the hardwood substrate, let the full block colonise, then move on to fruiting.
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. Artisan Mushrooms all-in-one hardwood grow bags are designed to give wood-loving species a suitable grain-and-hardwood growing medium in one bag, making them a simple option for home Reishi cultivation.
Reishi rewards patience
Reishi isn't the fastest mushroom you'll ever grow, but it might be one of the most interesting.
For the easiest route, start with clean Reishi liquid culture and an all-in-one hardwood grow bag. Allow the grain section to colonise, mix it through the hardwood substrate, give the full block enough time to establish itself and then use fresh-air exchange to influence the fruiting 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.