Our Sterile CVG Mushroom Substrate Bags provide a clean & nutrient balanced growing medium designed to support healthy mushroom growth after fully colonised grain spawn has been mixed into the substrate.
Made from a carefully prepared blend of premium coco coir, vermiculite & gypsum, each bag is hydrated to optimal field capacity before being professionally sterilised under clean lab conditions. This creates an ideal environment for mycelium expansion helping growers achieve healthy flushes while reducing the risk of contamination.
Whether you're expanding fully colonised grain spawn or producing large monotubs and fruiting blocks, our sterile CVG substrate is ready to use straight from the bag with no mixing or preparation required.
Why Choose Our Sterile CVG Substrate Bags?
Our CVG substrate has been developed to provide excellent moisture retention, structure, and aeration which helps consistent growing conditions throughout the colonisation and fruiting process.
Benefits include:
- Professionally sterilised and ready to use
- Premium coco coir, vermiculite and gypsum blend
- Excellent moisture retention
- Supports strong mycelium growth
- Reduces preparation time
- Suitable for home and commercial growers
- Produced under clean laboratory conditions
- Fast UK dispatch
Each batch is carefully hydrated before sterilisation to provide consistent moisture levels throughout the substrate.
Which Mushroom Species Is This Substrate Suitable For?
Our sterile CVG substrate is best suited to gourmet mushroom species that perform well on coco coir-based substrate blends after colonised grain spawn has been prepared.
Suitable species include:
- Pink Oyster Mushroom
- Pearl Oyster Mushroom
- Blue Oyster Mushroom
- Golden Oyster Mushroom
- Elm Oyster Mushroom
- King Oyster Mushroom
- Lion's Mane Mushroom
These species are known for vigorous colonisation and excellent performance on CVG-based substrate.
How Do You Use a Sterile CVG Mushroom Substrate Bag?
Step 1: Prepare Fully Colonised Grain Spawn
Ensure your grain spawn has completely colonised before opening either bag.
Step 2: Mix the Spawn and Substrate
Transfer the fully colonised grain spawn into the sterile CVG substrate bag or a clean mixing container and thoroughly distribute the grain throughout the substrate.
Step 3: Allow Full Colonisation
Seal the substrate and allow the mycelium to colonise the entire block before introducing fruiting conditions.
Step 4: Begin Fruiting
Once fully colonised, provide fresh air exchange, indirect light, and suitable humidity to encourage healthy mushroom development.
What Is Inside Our CVG Substrate?
Each sterile substrate bag contains a premium blend of:
- Coco coir
- Vermiculite
- Gypsum
The substrate is hydrated to optimal field capacity before being sterilised under controlled laboratory conditions to help maintain consistency and reduce contamination risk.
What Makes Our Sterile CVG Bags Different?
Our sterile CVG substrate bags are prepared using professional laboratory equipment and carefully selected ingredients to deliver consistent quality from every batch.
Features include:
- Professionally sterilised substrate
- Premium natural ingredients
- Excellent water retention
- Consistent texture and moisture content
- Durable mushroom grow bag
- Ready to use straight from delivery
- Suitable for beginner and experienced growers
How Should Sterile CVG Bags Be Stored?
For best results, we recommend using your sterile CVG substrate soon after delivery.
If storage is required:
- Store in a cool, dry place
- Keep away from direct sunlight
- Keep the bag sealed until required
- Do not freeze
When stored correctly, sterile substrate bags can remain usable for several months.
Important Information
Please note:
- This product contains sterile CVG substrate only.
- Grain spawn, liquid culture, and spores are sold separately.
- Grain spawn must be fully colonised before mixing with the substrate.