How to Grow Lion’s Mane Mushrooms at Home: Full Grow Guide
Lion’s Mane can grow without a complicated setup, but getting a full, fluffy shape depends on the fruiting environment. This method takes the grow from liquid culture and grain spawn to a hardwood block, then balances humidity with regular fresh air.
For this grow, I used whole oats, a sterilized Master’s Mix block, and a controlled fruiting chamber. The numbers below are the recipe and settings I used, not universal settings for every room or chamber.
At a glance
- Grain spawn: hydrate whole oats, drain and dry the outside, then sterilize them in jars.
- Liquid culture: use about 2–3 mL per jar in this method, working cleanly.
- One 5 lb block: 2 lb pre-mixed Master’s Mix pellets plus 3 lb water.
- Sterilization: 15 psi for 2½ hours, then cool the bags completely before adding spawn.
- Fruiting example: 88% humidity, with the intake fan on for 1 minute and off for 10.
- Harvest: I pick the mushroom when its spines are around ¼ inch long.
Your cooker, grow bags, room, and chamber affect the details. Follow the instructions for your equipment and use the fruit’s growth as feedback.
Watch the full Lion’s Mane grow
Watch it on YouTube if you’d like to see each step in motion.
Before you start: this is a grain-to-block grow, not a ready-to-fruit kit. It uses clean inoculation, a pressure cooker, and a supplemented hardwood substrate that must be sterilized before spawn is added.
1. Make clean Lion’s Mane grain spawn
Grain spawn is sterilized grain colonized by mushroom mycelium. I use whole oats for this grow. Hydrate the oats, drain them well, and let the outside dry before loading them into jars. The grain should be moist inside without a wet coating on the outside.
Fill jars and sterilize the grain in a pressure cooker, using the time and pressure appropriate for your equipment and jar size. For 1-Quart jars, I perform a 90 minute cycle at 15 PSI. Let the jars cool completely before inoculating. If you want to skip preparing oats, ready-to-eat rice bags are another possible route.
In a still-air box or in front of a flow hood, clean your work area, gloves, jars, and tools with 70% isopropyl alcohol. Add about 2–3 mL of Lion’s Mane liquid culture per jar, close the jars, and let them colonize. The Lion’s Mane culture page has the syringe-use instructions and storage details.
A still-air box, gloves, and 70% isopropyl alcohol are in my opinion the most important beginner supplies for clean work. Use the approach that fits your workspace and skill level.
Wait until the grain is fully colonized before using it for the next step. Unusual colors or slimy growth are warning signs, so don’t mix questionable grain into a clean substrate.
2. Prepare and sterilize the Master’s Mix block
Lion’s Mane grows on hardwood. Master’s Mix combines hardwood and soy hulls in equal parts, giving the block a wood-based substrate with added nutrition. I use a pre-mixed Master’s Mix for this grow.
One 5 lb substrate bag
- 2 lb Master’s Mix pellets
- 3 lb water
Mix the pellets and water until the material is evenly hydrated, then load the mix into a suitable filter-patch grow bag. A kitchen scale makes this recipe repeatable. I sterilize the bags at 15 psi for 2½ hours, then leave them to cool completely. The block is nutrient-rich, so sterilizing it before adding spawn is necessary.
3. Mix the grain spawn into the cooled block
Once the bag has cooled to room temperature, break up the colonized grain and add it to the substrate. Work in a clean space, open the bag only as long as needed, and mix the spawn evenly through the block. Seal the bag and leave it to colonize over the next several weeks.
During colonization, the block should gradually turn white. Lion’s Mane can sometimes form small blobs inside the bag before the block looks completely finished. Give the substrate time to colonize well before moving it into fruiting conditions.
4. Balance humidity and fresh air
This is the part that changed the result for me. Lion’s Mane needs humid air, but it also needs regular fresh-air exchange. Too much direct airflow can dry the fruit; stale air can encourage long, branched growth instead of a dense, rounded cluster.
In this chamber, I set humidity to 88% and ran the intake fan for 1 minute, then off for 10 minutes. Those are the settings that worked in my setup, not fixed targets for every grow. Your chamber size, sensor location, room, and airflow all affect what you need. A monotub can work, too, but you’ll need a way to keep conditions from swinging too far between checks.
You don’t need the exact equipment I use. A simple chamber can work if you can maintain humidity and provide fresh air consistently. If you’re comparing options, my mushroom growing gear list has the fruiting and hardwood supplies I use.
5. Give the block a small fruiting opening
Once the block is ready to fruit, cut a small slit, about 2 inches, where you want the mushroom to grow. Keep the rest of the bag snug against the block. In this grow I covered the filter patch, rolled up the extra bag, and taped it down so the opening was the main place exposed to fresh air.
Small white bumps may appear around the slit after a few days. They can look like little blobs at first, then develop into the soft, dangling spines that give Lion’s Mane its shaggy shape.
How the fruit can help you adjust conditions
- Long, branched, coral-like growth: check whether the chamber needs more fresh-air exchange.
- Drying or early yellowing: check humidity and whether air is blowing directly on the fruit.
- A rounded, fluffy cluster with short white spines: conditions may be closer to what this block needs.
These are clues from my grow, not a diagnosis by themselves. Change one condition at a time and give the mushroom a chance to respond.
6. Harvest before the spines grow too long
I harvest when the spines are around ¼ inch long, before they extend much further. Gently twist the fruiting body off the block. After harvest, return the block to fruiting conditions and watch for another flush. How many flushes you get depends on the block and the grow.
Quick answers
Can Lion’s Mane grow in a monotub?
Yes. I fruited my first block in a monotub, but managing fresh air and humidity took more attention. A tub or chamber can work as long as you keep both needs in balance.
Do I need an automated fruiting chamber?
No. A fruiting chamber with scheduled fresh air and controlled humidity can make the process easier to manage, but you don’t need automated equipment. The key is keeping conditions consistent enough for the block you’re growing.
How much liquid culture should I use?
For this grow I used about 2–3 mL per grain jar. My Lion’s Mane culture page explains the recommended amount for the grain quantity listed there.
Can I use plain hardwood instead of Master’s Mix?
You can, but I've had my best success with master's mix. Other hardwood recipes can work, but they may have different hydration and sterilization requirements. Use a recipe suited to your materials and species.
What made the biggest difference
Clean grain spawn, a fully colonized hardwood block, and a fruiting space with both humidity and fresh air.
For me, more consistent fruiting conditions made Lion’s Mane easier to manage and helped produce the shape I wanted.
Want to try a Lion’s Mane grow?
Start with a clean culture, then choose a hardwood method that suits your space and equipment.
Affiliate disclosure: Some links in this guide are affiliate links. If you buy through them, I may earn a commission at no extra cost to you.
Happy Growing!