Lion’s Mane Growing FAQs for Class and Information Resource
- Paul Rooney
- Apr 16
- 3 min read
The 4 Rules for Lion’s Mane
1. White block for cutting fruiting ‘X’
2. White mushroom for harvesting
3. High humidity without soaking
4. Cool fresh air without direct sun
How do I know when to score the bag to allow fruiting?
Score the bag when the block is fully colonized, meaning it looks solid white and the surface is densely covered with mycelium, with no large uncolonized patches left.
This is because, once the block is fully colonized, the fungus has already claimed the substrate and is ready to shift from “growing through food” to “making mushrooms.” If you cut too early, you increase the chance of contamination and weak or uneven fruiting. For lion’s mane, Cornell University recommends cutting small V or X openings on the side of the bag rather than top fruiting it. (Cornell Small Farms)
How do I know when to harvest the lion’s mane?
Harvest when the cluster is full-sized, still bright white, and the “teeth” or spines have clearly formed but have not yet started yellowing, browning, drying, or becoming overly elongated and shaggy. The reason is that lion’s mane has its best texture and quality just before it begins to age. Once it starts discoloring, it is moving past peak quality and can become drier and more bitter.
Do I need to mist the opening I made in the block?
Usually yes, but gently - you are trying to maintain humidity around the opening, not soak the mushroom directly. A light mist to keep the cut area from drying out is helpful, especially in a dry house. Lion’s mane needs high humidity to form healthy fruiting bodies, but standing water or constant saturation can encourage bacterial problems or malformed growth.
How do I get a second flush from the block?
After the first harvest, trim off any leftover mushroom tissue, keep the block hydrated, and continue giving it humidity and fresh air. In many cases, new pins appear from the same opening in about 2 weeks. If the block seems stalled and dry, you can soak or rehydrate it before trying again. The first flush uses up a lot of available water, so the block often needs time and moisture to recharge before it can fruit again.
What are the best conditions for my fruiting block?
Lion’s mane likes it cool and humid. A good target is roughly 60-72°F with high humidity, around 85-95%, plus regular fresh air exchange and bright indirect light. The reason is that lion’s mane fruits best when the environment signals “open air, moist surface, cooler conditions.” If it is too dry, the fruiting body can stall or crack. If air is too stagnant, lion’s mane can become misshapen or overly elongated.
Where should I put the fruiting block?
Put it somewhere with bright indirect light, good airflow, and no direct sun, away from heating vents, radiators, woodstoves, or very drafty windows. Remember, they need humidity so avoid any place that can dry the block out. A kitchen counter, shelf, or table in a cool room often works well if the air is not too dry. The reason is that direct sun and heat dry the block out fast, while totally stagnant air can lead to poor fruiting.
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