Millet Grain | 1 kg Bulk Bag

Millet is rapidly becoming the standard grain for mushroom cultivation, and it earns that position with hard data: 8 000 kernels per kilogram versus rye's 3 000 means more than twice as many points of contact between your spawn and the substrate. That translates into faster, more uniform colonisation, fewer contamination opportunities and better predictability for beginners and pros alike.

Product specifications

• Net weight: 1 kg of dry millet grain
• Species: Panicum miliaceum — proso millet, peeled
• Kernels per kg: approximately 8 000
• Origin: GMO-free, European supply
• Use: grain spawn substrate after hydration and pressure sterilisation

Why millet outperforms rye for grain spawn

• More inoculation points — 8 000 kernels/kg vs. ~3 000 for rye means a single spawn jar carries far more potential colonisation starts
• Faster colonisation — full jar colonisation in 10–14 days at 24–27 °C, compared to 14–21 days for rye
• Better G2G expansion — millet's small size keeps grain-to-grain transfers homogeneous; one colonised millet jar can spawn 5–10 fresh jars
• Hard outer husk — protects against contamination during shaking and inoculation
• Lower water uptake — easier to hit the correct moisture target than rye

Which mushrooms grow on millet grain spawn

Millet works as grain spawn for nearly every cultivated species:

• Psilocybe cubensis — all strains
• Pleurotus ostreatus and other oysters
• Hericium erinaceus — lion's mane
• Lentinula edodes — shiitake (with hardwood transfer)
• Ganoderma lucidum — reishi
• Agaricus species — button mushroom (with manure substrate)

How to prepare millet grain spawn

1. Rinse — rinse the dry millet under clean water until run-off is clear
2. Soak — submerge in clean water for 12–18 hours
3. Simmer — drain and simmer for 10–15 minutes; the kernels should be tender but not split
4. Drain & dry — spread on a clean towel to surface-dry until the kernels no longer feel wet
5. Jar & sterilise — load into autoclavable jars or bags with a 5.0 µm filter patch; sterilise at 121 °C / 15 PSI for 90–120 minutes
6. Cool — let the jars cool to 24–27 °C before inoculation
7. Inoculate — add 1–3 ml of liquid culture or spore syringe per jar through a self-healing injection port or under a flow hood
8. Incubate — keep at 24–27 °C in the dark; shake gently after the first signs of colonisation

Skip the prep work

If you'd rather buy a fully sterilised, ready-to-inoculate spawn bag instead of preparing grain from scratch, see our sterile millet spawn bags: Sterile Millet Spawn Bag .

Storage

Store the unopened bag in a cool, dry place, away from direct sunlight and rodents. Dry millet has a shelf life of 12+ months when kept dry.