Grain Spawn / Cereal Spawn

Grain Spawn for Mushroom Cultivation

Whether you’re a hobby grower or building a professional mushroom farm – high-quality grain spawn is the foundation of every successful harvest. At Stoffn, we produce our grain spawn with the highest standards of sterility, mycelium density and freshness.

What Makes Our Grain Spawn Special?

Sterility & Contamination-Free Production

Every batch is sterilised using proven methods and inoculated under clean conditions. Our grain spawn is completely free from mould, bacteria and yeast – guaranteed by a fresh, earthy smell and rigorous quality control.

Dense, Vigorous Mycelium

Our spawn features dense, fully colonised grain with a strong white mycelial mat. Fast, aggressive mycelium growth means quicker colonisation of your substrate – and a shorter time to your first harvest.

Premium Grain Quality

We use only high-quality, uniform grain with an ideal moisture content of around 50–55%. No pests, no impurities – just perfectly hydrated grain, ready to perform.

Sterile, Filter-Patch Packaging

Our grain spawn is packed in airtight, sterile bags with filter patches for optimal gas exchange. This keeps contamination out while keeping your mycelium healthy during transit and storage.

Consistent Batch Quality

Every batch is checked for even mycelium distribution and homogeneous colonisation. You get reproducible results – whether it’s your first grow or your hundredth.

Always Fresh

We produce in small batches to ensure freshness. Each bag is labelled with the production date so you always know exactly what you’re working with.

Why the Right Grain Spawn Matters

The grain spawn you choose directly affects your germination rate, colonisation speed and ultimately your yield. Low-quality spawn means slow growth, higher contamination risk and disappointing harvests. Our spawn is designed for high germination rates and strong fruiting body development – giving you more mushrooms per bag, every time.

Suitable for a Wide Range of Mushroom Species

Our grain spawn works excellently for:

• Oyster mushrooms (Pleurotus ostreatus and varieties)
• Shiitake (Lentinula edodes)
• King oyster mushrooms (Pleurotus eryngii)
• Lion’s Mane (Hericium erinaceus)
• And many more

New to mushroom cultivation? Check out our beginner mushroom growing kits or join one of our mushroom growing courses.