CVG
Coco coir, vermiculite and gypsum, pasteurised with boiling water.
Dry rye294 gfor the grain spawn
Spawn500 g1 : 3.6 by weight to substrate
Wet substrate1.81 kg0.32 coir bricks
Container floor30 × 25 cm750 cm² at this depth
Materials
| Item | Amount |
|---|---|
| Grain spawn (colonised rye)from 294 g of dry rye (× 1.7 after soaking and simmering) | 500 g |
| Coco coir0.32 bricks of 650 g | 210 g |
| Vermiculiteabout 1.74 L; depends on grade | 165 g |
| Limeoptional; raises the pH | 17 g |
| Gypsum | 17 g |
| Boiling wateradd gradually; the squeeze test decides | 1.4 L |
Batch
- Wet substrate, total
- 1.81 kg
- Spawn : substrateby weight
- 1 : 3.6
- CVG top layerset aside before mixing in the spawn
- 452 g
- Mass in the containerspawn + substrate, approx.
- 4.5 L
- Container floore.g. 30 × 25 cm
- 750 cm²
Preparation
Rye grain spawn
2–3 weeks ahead. Bought grain spawn replaces this stage.
- Weigh 294 g of dry rye, soak 12–24 h and simmer 10–15 min.
- Drain and let the surface dry. This gives about 500 g of grain.
- Fill jars or filter patch bags and sterilise 90–120 min at 121 °C (pressure cooker, 15 psi).
- Inoculate and keep at the colonisation temperature until fully colonised.
Substrate
on spawning day
- Put coir, vermiculite, lime and gypsum in a bucket with a lid.
- Add the boiling water (1.4 L) gradually: a hard squeeze should give a few drops.
- Close the bucket and wrap it in a towel; this is the pasteurisation. Small batches lose heat quickly.
- Once below 30 °C, set aside 452 g for the top and mix the rest with the spawn.
- Spread it 6 cm deep in the container and cover with the reserved part.
Edible species on CVG
Agaricus grows on CVG with manure and a casing. Oysters and lion's mane grow on plain CVG, though their standard substrate is straw or sawdust.
Notes
- Use lime or crushed shell in the substrate, not both: double calcium pushes the pH too high.