How to Grow Lion’s Mane Mushrooms Indoors (No Experience Required)

Written by the MyceliumNest Team

4+ years growing lion’s mane through multiple substrate formulations and fruiting environments. This guide reflects our direct cultivation experience and cross-references published mycology literature.

Lion’s mane mushrooms (Hericium erinaceus) are one of the most extraordinary fungi you can grow at home — and one of the most misunderstood in terms of difficulty. Many beginners assume the dramatic appearance of lion’s mane (those impossibly beautiful cascading white spines) means an equally demanding grow. It doesn’t.

This guide explains exactly how to grow lion’s mane mushrooms indoors, from choosing your substrate through to harvesting and triggering second flushes. By the end, you’ll understand why experienced growers often describe lion’s mane as more forgiving than shiitake and nearly as easy as oyster — and why it might be the second species you ever grow.

What Is Lion’s Mane & Why Grow It?

Lion’s mane (Hericium erinaceus) is a tooth fungus — unlike the cap-and-gills structure of most mushrooms, it produces a dense mass of fine, downward-cascading spines that resemble, unmistakably, a white lion’s mane or a coral reef creature. It grows naturally on the wounds of hardwood trees, primarily oaks, beeches, and maples, across North America, Europe, and Asia.

The Case for Growing Lion’s Mane at Home

• Extraordinary flavour. Fresh lion’s mane has a seafood-like flavour — often compared to crab or lobster — with a satisfying, meaty texture. It’s one of the most gastronomically interesting edible mushrooms in existence. Browse our lion’s mane mushroom recipes to see what’s possible.
• Strong research interest. Lion’s mane contains compounds called hericenones and erinacines that have shown in preliminary research to support nerve growth factor (NGF) synthesis. If the growing science is the reason you’re here, read our deep dive into what the research actually shows.
• Genuinely beginner-accessible. On hardwood sawdust substrate with a spawn rate above 15%, lion’s mane colonises reliably and pins with relatively modest environmental management compared to many other species.
• Significant cost savings. Fresh lion’s mane retails for $20–$40 per pound at farmers markets and specialty grocers. Growing your own cuts this to under $3 per pound in substrate and spawn costs once you’re producing consistently.

What You’ll Need

Option A: Lion’s Mane Grow Kit (Recommended for First Grow)

A fully colonised lion’s mane grow kit removes the most technically demanding steps — substrate preparation, sterilisation at 121°C (which requires a pressure cooker), and inoculation. For a first grow, we strongly recommend starting with a kit to build confidence before scaling up to scratch grows.

North Spore’s Lion’s Mane Spray-and-Grow Kit uses certified organic hardwood substrate, produces reliable pins within 5–10 days, and is available via Amazon here. See our full mushroom grow kit comparison for alternative options at different price points.

Option B: Growing Lion’s Mane From Scratch

Note on pressure cookers: Unlike oyster mushrooms, lion’s mane on supplemented hardwood substrate requires sterilisation (121°C / 15 PSI for 2.5 hours) not just pasteurisation. This is because the supplements (bran) are rich in nutrients that bacteria and competing fungi thrive on. A pressure cooker is non-negotiable for scratch grows on supplemented substrate. See our pressure cooker guide for the best models. The Presto 23-Quart Pressure Canner is our top pick and handles a full batch of jars efficiently.

The Best Substrate for Lion’s Mane

Lion’s mane is a lignin-decomposing wood-lover (saprotrophic on hardwoods). It requires a hardwood-based substrate and — unlike oyster mushrooms — benefits significantly from nutritional supplementation.

Master’s Mix: The Gold Standard for Yield

Master’s Mix is the most widely used supplemented hardwood substrate in hobby mycology. It produces exceptional yields and colonises reliably with lion’s mane. The formula is simple:

Simpler Alternative: HWFP Only (No Pressure Cooker Required)

If you don’t have a pressure cooker yet, pure (unsupplemented) hardwood fuel pellets can be pasteurised at 82°C for 90 minutes and used successfully for lion’s mane — yields will be 30–40% lower than Master’s Mix, but the process is far simpler. This is an excellent option for a first scratch grow before investing in pressure cooking equipment.

Step-by-Step Guide: How to Grow Lion’s Mane Mushrooms Indoor

Step 1: Prepare and Sterilise Your Substrate

1. Mix HWFP and wheat bran dry, then add water gradually until you reach 60–65% moisture (a firm handful should release no more than a few drops when squeezed hard)
2. Pack into quart mason jars or polypropylene grow bags — do not overfill; leave 15–20% headspace for mycelium respiration
3. Add a polyfill or Tyvek lid (for jars) or seal bags and place in a pressure cooker
4. Sterilise at 15 PSI for 2.5 hours minimum. Let the cooker depressurise naturally — do not force-cool
5. Allow jars/bags to cool completely to room temperature (24 hours minimum) before inoculating

Step 2: Inoculate

1. Wipe your entire work surface with 70% isopropyl alcohol. Wear nitrile gloves. Spray gloves with IPA before handling spawn or jars.
2. Work as quickly and confidently as possible — the longer jars or bags are open, the higher the contamination risk
3. Introduce grain spawn at 15–20% of substrate weight. Lion’s mane benefits from a higher spawn rate than oyster — it colonises more slowly and needs the competitive advantage
4. Mix spawn thoroughly through the substrate if using bags; shake jar well if using jars
5. Seal immediately. Shake once more to distribute

Step 3: Incubate

Place inoculated jars or bags in a warm, dark location for incubation.

Lion’s mane mycelium is white and tends to grow in thick, rope-like strands rather than the fluffy cottony growth of oyster mushrooms. This is normal — healthy lion’s mane mycelium often looks more dense and organised than other species. Watch for any green, black, or pink colouration which signals contamination — consult our mushroom contamination guide if you see these signs.

Step 4: Initiate Fruiting

Once your block or jar is completely white — no visible substrate colour showing through — it’s ready to fruit. Lion’s mane fruiting initiation is simpler than many other species because it doesn’t require a dramatic temperature drop. The key triggers are:

1. Introduce fresh air: Cut a 5–8cm X or square opening in the bag, or remove the jar lid and replace with damp paper towel or a loose foil cover
2. Raise humidity to 85–95%: Begin misting the fruiting site 2–3 times daily, or move to a fruiting chamber
3. Indirect light: 12 hours of ambient indirect light daily helps direct growth orientation — the lion’s mane grows toward light
4. Keep temperature at 18–22°C: A slight drop from incubation temperature helps trigger pinning

Fruiting Conditions: The Critical Details

Lion’s mane is more sensitive to fruiting environment than oyster mushrooms in one specific way: it is highly sensitive to elevated CO₂ levels.

CO₂ and Lion’s Mane: Why Fresh Air Exchange Is Non-Negotiable

In nature, lion’s mane grows on exposed tree wounds where fresh air is abundant. In cultivation, elevated CO₂ causes the spines to elongate and the fruiting body to become loose and icicle-like rather than the dense, compact pom-pom shape that commands premium prices at markets — and tastes best in the kitchen.

Practical guide: if your lion’s mane is developing long, drooping spines rather than a compact ball, increase fresh air exchange immediately. This means enlarging your bag opening, adding a small fan on a timer nearby (not blowing directly onto the mushroom), or moving to a better-ventilated space.

For detailed environmental parameters across the full mushroom lifecycle, see our complete fruiting conditions guide. For building an enclosed fruiting space with controlled FAE and humidity, read our fruiting chamber build guide.

Ideal Lion’s Mane Fruiting Environment

A digital hygrometer and thermometer combo is essential for monitoring your fruiting environment. This is a $12–$20 investment that removes guesswork entirely.

Harvesting Lion’s Mane Correctly

When to Harvest

Harvest timing for lion’s mane is different from most mushrooms — you watch for colour, not size or cap shape.

Harvest immediately when you notice the very tips of the outermost spines beginning to show the faintest yellow or tan tinge. At this point the mushroom is at peak flavour, peak density, and peak nutritional content. Do not wait until the browning is obvious — by then, the outer spines have already begun to break down and the flavour becomes noticeably more bitter.

How to Harvest

1. Clean your hands thoroughly or wear gloves
2. Grasp the base of the entire fruiting body firmly
3. Twist gently while pulling — it should detach cleanly in one piece
4. Remove any attached substrate from the base with a clean brush or dry cloth
5. Clean the harvest site on the block — remove any remaining mycelium stumps cleanly

Storage

Fresh lion’s mane should be used within 3–5 days. Store loosely wrapped in a paper bag in the refrigerator — never in an airtight container (it needs to breathe). For longer storage, slice thinly and dry in a food dehydrator at 40–50°C until completely crisp — dried lion’s mane rehydrates beautifully in stocks and soups.

Why People Grow Lion’s Mane: What the Research Shows

Many growers start their lion’s mane journey after encountering claims about brain health, nerve regeneration, or cognitive enhancement. These claims are not baseless — but they require careful framing.

The Science (Plain Language)

Lion’s mane contains two classes of bioactive compounds not found in other mushrooms: hericenones (in the fruiting body) and erinacines (in the mycelium). Both have shown in laboratory and some human studies to stimulate the synthesis of nerve growth factor (NGF) — a protein critical for the survival and maintenance of neurons.

A 2009 double-blind, placebo-controlled clinical trial published in Phytotherapy Research found significant improvement in mild cognitive impairment scores in participants taking lion’s mane extract versus placebo. A 2023 Australian study found improved processing speed and stress indicators in young adults after 28 days of supplementation.

These results are promising but preliminary. The research base is still small, and most studies used specific extract preparations — not the whole fruiting body you’ll harvest. For our complete, evidence-based analysis of what the research does and does not support, read our full deep dive into lion’s mane research.

If you’re interested in taking lion’s mane as a supplement rather than (or in addition to) growing it, our best lion’s mane supplement guide ranks the top brands by fruiting body content, beta-glucan concentration, and third-party testing.

Common Lion’s Mane Growing Problems

Problem: Long, Drooping, Icicle-Like Spines

Cause: Elevated CO₂ — the single most common lion’s mane fruiting problem.

Solution: Increase fresh air exchange immediately. Enlarge your bag opening, add gentle airflow (fan on a timer, not directed at the mushroom), or move to a more ventilated location. The growth will self-correct within 12–24 hours once CO₂ levels drop.

Problem: Browning Tips Before Harvest Size

Cause: Usually humidity too low (below 80% RH) or direct airflow drying the outer spines.

Solution: Increase misting frequency. Check your hygrometer — if you don’t have one, install one today. Point any fans away from the block. Brown tips do not mean the mushroom is ruined — harvest immediately and trim the brown portions. The interior will still be white and fresh.

Problem: Block Fully White But No Pins After 10+ Days of Fruiting Trigger

Cause: Usually humidity too low, CO₂ too high, or temperature outside the ideal range. Lion’s mane can be slow to initiate pinning compared to oyster mushrooms.

Solution: Verify environmental conditions with a hygrometer/thermometer. Try cutting a larger opening in the bag. Some growers have success with a brief cold shock — moving the block to a cooler location (10–15°C) for 12 hours before returning to fruiting conditions.

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