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Sterile Millet Spawn Bag | 2000 ml & 4000 ml Grain Spawn
Pre-sterilised millet grain spawn bag with self-healing injection port. Millet is the commercial gold-standard for grain spawn: small kernels mean thousands of inoculation points per bag, fast colonisation (10–14 days for Psilocybe cubensis) and reliable expansion ratios. Available in 2000 ml and 4000 ml. Ready to inoculate straight out of the box — no soak, no boil, no autoclave.
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€27.50
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Product Description
Details
Skip three days of grain prep. Our sterile millet spawn bags arrive pressure-cooked, pre-hydrated and ready for immediate inoculation. Millet is the carrier of choice in commercial mycology — and now you get the same lab-grade product without owning a pressure cooker.
Product specifications
- Available sizes: 2000 ml and 4000 ml autoclavable bags
- Contents: pre-soaked, pre-cooked, fully sterilised millet (Panicum miliaceum)
- Sterilisation: 121 °C / 15 PSI / 90–120 minutes — every batch quality-controlled
- Packaging: heat-sealed bag with 5.0 µm micro-filter patch for gas exchange
- Inoculation: self-healing injection port included
- Moisture content: ~28 % — dialled in for grain spawn colonisation
Why millet beats other grain spawns
Millet kernels are small — roughly 8 000 grains per kilogram against around 3 000 for rye. More grains means more inoculation points for mycelium to jump between, which translates into faster colonisation and a more even spawn run. The thin husk on each kernel resists contamination, the light yellow colour makes any mould instantly visible during inspection, and the kernel size produces no compaction or pooled water at the bottom of the bag.
For commercial growers and serious hobbyists, millet is the standard for one reason: it works the fastest and the most predictably.
Which mushrooms grow on millet spawn
Millet grain spawn is a universal carrier compatible with all major hobby and gourmet species:
- Psilocybe cubensis — all strains (Golden Teacher, B+, PES, McKennaii, etc.)
- Pleurotus spp. — oyster mushrooms (pink, blue, king, golden)
- Hericium erinaceus — lion's mane
- Stropharia rugosoannulata — wine cap
- Agaricus spp. — button and portobello
- Lentinula edodes — shiitake (slower coloniser)
How to use
- Prepare — work in a clean space, wipe surfaces with isopropyl alcohol, ideally use a still air box or laminar flow hood
- Inoculate — push your liquid culture or spore syringe through the self-healing port, 1–2 cc per 2000 ml bag (2–3 cc for 4000 ml)
- Incubate — store at 24–27 °C in the dark; first white fuzz appears within ~7 days
- Shake — once colonisation reaches 30–50 %, gently break up the colonised grain to redistribute mycelium and accelerate the final run
- Full colonisation — typically 10–14 days for cubensis at optimal temperature
- Use — inoculate bulk substrate at 1:2 spawn-to-substrate ratio (see )
Grain-to-grain (G2G) expansion
One colonised millet spawn bag can be used to inoculate up to ten times its weight in fresh sterilised grain. Standard expansion ratios are 1:5 to 1:10. We recommend no more than 3–5 generations of G2G transfer before returning to fresh culture to avoid genetic drift.
Storage
Store unopened bags in a cool dark place. Do not refrigerate — temperature shock can crack the bag seal. Use within 3 months of purchase for best colonisation speed.
Want a different grain?
We also stock for contamination-resistant cultivation, and bulk if you prefer to prepare your own spawn.
Additional Info
Additional Info
| Productcode | MCS.GRSPA.CONF.MILL |
|---|---|
| Origin | No |
| Sterile | No |
Customer Reviews
5 Item(s)
per page
- Great spawn bag Review by Rok
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I bought the smaller version. It fully works, so far no contamination. (Posted on 2/17/2026)Rating - GOOD ! Review by frederic
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perfect spawn bag.Rating
the XL version is so useful. (Posted on 12/12/2025) - Depende on the choice. Review by Jorge
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Ived tryied for the first time two of these milhete bags insteade of my usual corn spawn. I love the bags of corn because they become soft to the bags after been "cooked" and after innoculation and the formation of the mycelium, the bags dont become "marked". With the milhete, at least with One of these ones, the innoculation made the milhete to hard to the bags, making it all with maybe breaking points. The other bags is ok. Probally these bag didnt had enought misture. I dont know. Its suposed to BE more quick with milhete and this bag is not going good. Maybe Next time i go for insurense and choose corn. But at least try One time and see. Because One went well. (Posted on 10/25/2025)Rating - great spawn bag Review by frederic
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great spawn bag.Rating
Don't over eat if you don't want a bacillus contamination... (Posted on 10/24/2025) - strong Review by Sehuti
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This handles summer time heat better than corn, seems to be flawless (Posted on 7/27/2025)Rating
5 Item(s)
per page
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