The Third Mark · A cultivation reference
Most growing advice is
confidently wrong.
This is a working reference, not a blog. Symptom-first contamination diagnosis, species pages with actual numbers in them, and a straight answer to the question you came here with.
What are you looking at?
Describe the symptom, not the cause. You don't know you have Trichoderma — you know something is green.
- Green or blue-green patches on substrate or grain
- Fuzzy grey growth, wispy like cobweb
- Grain jars not colonising, grey slime, sour smell
- Long thin stems, tiny caps, stretching mushrooms
- Pins forming then aborting, primordia dying back
- Yellow or amber liquid on the mycelium
- Wet slimy patches on fruits, sour smell
- Black fuzzy growth with pinhead tips
First principles
You are not growing a mushroom.
You are growing mycelium — a branching network of thread-like cells called hyphae that spends its life eating the substrate you gave it. The mushroom is not the organism. It is the fruiting body: a short-lived reproductive structure the mycelium builds when conditions tell it to, in roughly the way an apple tree makes an apple.
This reframing fixes most beginner problems on its own. Weeks of your grow are spent managing an organism you can barely see, in the dark, inside a bag. The visible mushroom part takes about five days at the end. If you are worrying about light levels while your grain is still colonising, you are looking at the wrong stage.
Fungi are not plants. They have no chlorophyll and make no food from sunlight — they digest externally, secreting enzymes into their food and absorbing what dissolves. Genetically they sit closer to animals than to plants, which is a strange fact and also a practical one: what rots your substrate is competing with your fungus for the same meal, using the same strategy.
Follow the full process →- 1 Spore Two of them meet and fuse
- 2 Mycelium Weeks. This is the organism
- 3 Primordia Pinning — triggered by change
- 4 Fruiting body Days. The part you eat
The reference
Diagnose
Symptom-first. You do not know you have Trichoderma — you know something is green. Find what you are looking at, whether it can be saved, and what caused it.
Species
One page per species, same template throughout, so the numbers are comparable. Temperatures, timings and yields rather than adjectives.
Substrate
Straw, sawdust, grain, coir, manure — how to treat each one, what to supplement it with, and how wet it should actually be.
Process
The spine of every grow, in order. Each stage links to the next, and each one tells you what "done" looks like before you move on.
Setups
What to build, what to buy, and what you can skip for longer than the internet suggests.
Start here
A progression, not a pile. Each step assumes the one before it and adds exactly one new skill.
Species, with numbers
Same template on every page, so you can actually compare them.
Blue oyster
The species to start with. Fast, aggressive, forgiving of technique, and it fruits at room temperature on almost anything.
Lion's mane
A toothed, cascading fruiting body with crab-like texture. Easy to colonise, fussy to fruit well, and the most commercially valuable of the beginner-accessible species.
Shiitake
The most demanding of the common gourmet species and the most rewarding. Long colonisation, a browning phase, and a cold shock — and then it fruits for months.
King oyster
Thick-stemmed, dense, and the closest thing to a scallop in the fungal kingdom. Fussier about CO₂ than any other oyster and worth the trouble.
Functional mushrooms
What the research actually says
Reishi, lion's mane, turkey tail, cordyceps. Traditional use, what has been studied, and — the part usually left out — how thin the human evidence still is.
Fungal curiosities
Things that are true and strange
The largest organism on Earth is a fungus. Some species have thousands of mating types. Others aim their spores at the sun. Sourced, not repeated.
How this site is written
- Numbers, not adjectives. "Colonises in 10–14 days at 75°F" beats "colonises quickly." If a page can't be specific, it says so.
- Failures are documented. Contamination photographs are the most useful thing on a site like this, and stock images are obvious. Every failed tub gets photographed before it goes out.
- No health claims. Functional species pages describe traditional use and cite research. They never say a mushroom treats, prevents or cures anything, because it isn't known and it isn't legal.
- Untested is labelled untested. "I haven't grown this one" is more useful than confident secondhand instruction.