Substrate Additives for the Cultivation of Edible Mushrooms
Reliable Growth and Superior Structure
Substrates used in mushroom cultivation often lack sufficient structure, resulting in poor air exchange, compaction, and limited mushroom yield. To address this, a natural structuring agent is essential to increase bulk volume, optimize substrate aeration, and improve flow characteristics.
JRS offers purely plant-based additives made from corn cob granules or wood fibres, which have been specially developed to improve mushroom substrates. These materials ensure consistently high purity – ideal for professional use in edible mushroom cultivation.
- Safe and stable substrate base for optimal mushroom growth
- Improved structure and porosity
- Reliable source of celluloses, hemicelluloses and lignin
- Optimised flow properties for easier handling and processing
- Moisture buffering for consistent growing conditions
- Thermally treated & microbiologically safe
- Custom particle sizes for flexible substrate formulation
- HACCP certified
Application Areas:
Our substrate additives are suitable for a wide range of edible mushrooms, including:
- Gourmet Mushrooms (such as King Oyster, Shiitake, Maitake)
- Other Edible Mushroom Species
- Ideal for both professional and private growers
Flexible Raw Materials –
Perfectly Matched to Your
Substrate Mix
JRS provides a range of plant-based granule types and sizes to meet your exact substrate requirements. All our products are produced in Germany.
Corncob Granules
Corncob granules are of GMO-free raw material, mainly sourced in Germany and Central-Europe. Available as powder, granules or pellets.
- Rounded particle shape
- Excellent moisture regulation
- Biodegradable
- Many different particle sizes
Hardwood Granules
JRS Oak and Beech products are regionally sourced from sustainable forestry. Further hard and soft wood specialties (Alder, Poplar, Cherry, Spruce) are available.
- Fibrous or cubic structure
- From PEFC-certified, untreated domestic wood
- Thermal treatment for maximum purity
All Wood Types are Available in Different Particle Sizes.
Simple and Clean Application in Mushroom Growing
Our substrate additives can easily be combined and mixed with all typical substrate components.
- Constant moisture content
- Good flowability
- No segregation
- High purity for food production (HACCP certified)
Certified and Controlled Quality
JRS substrate additives are subject to strict quality and purity criteria and are suitable for organic agriculture and horticulture:
- FIBL compliant
- 100% plant-based: biodegradable and compostable
- ISO certified production
- HACCP-certified products for safe production of foodstuffs
- Thermal drying process for microbial safety
- PEFC-certified forestry for wood-based products
