Substrate & Preparation

Straw Pellets

Compressed straw pellets that hydrate fast and pasteurise easily.

Typical specifications
Pellet diameter	6 – 8 mm
Hydration ratio	1 kg pellets to 2.5 – 3 L water
Moisture target	70 – 75%
Treatment	Pasteurise 60 – 70 °C, 60 min
Supplement	Optional, keep low
Expansion	Approx. 2.5x by volume

Substrate & PreparationLarge batches

Overview

Straw pellets are milled straw compressed into dense cylinders. They hydrate in a fraction of the time whole straw takes, drain consistently, and hold an open structure that mycelium threads through well. They are the most practical bulk substrate for oyster mushrooms in a home set-up.

Primary stage: Colonization

Where it fits in the grow

Hydrated, drained, pasteurised and cooled before spawning.

Safety & handling

Straw that smells musty or shows dark mould has already begun composting and will almost always contaminate. Reject any bale that is damp or discoloured.

Practical advice

Drain thoroughly — straw should be damp to the touch but must not stream water when a handful is squeezed. Excess water creates anaerobic pockets bacteria love.

Educational only. Mycelium Works does not sell this or any other product, and we receive no payment for listing it. Specifications vary by manufacturer — always follow the maker’s instructions and local regulations.

Straw Pellets

Overview

Where it fits in the grow

Practical advice

Tools that pair with this

Substrate Mixing Tub

Hardwood Sawdust

Grain Spawn Bag

Coco Coir