Description
Vermiculite 100L Bag – Essential Substrate & Casing Layer for Mushroom Cultivation
Our 100L vermiculite bag is a must-have for every mushroom cultivator, whether you’re a beginner or running bulk projects. Vermiculite is lightweight, sterile, and highly absorbent, making it the perfect medium for mushroom growers who need consistent results. It plays a vital role in casing layers, bulk substrate mixes, and moisture retention, helping your mycelium thrive.
This premium horticultural-grade vermiculite provides excellent aeration while holding water evenly, ensuring that your mushroom cultures stay hydrated without becoming waterlogged. Mushroom growers use vermiculite to prepare PF Tek jars, casing layers for monotubs, and bulk grows because of its reliability and ease of use.
A 100-litre bag is perfect for serious cultivators who need a large, economical supply for ongoing projects. Whether you’re spawning grain into bulk substrate or building a humidity-retentive casing layer, vermiculite is an essential part of the toolkit.
🌱 Why Choose Our Vermiculite?
Large 100L volume – perfect for bulk mushroom growing projects
High water retention – keeps substrates and casings evenly hydrated
Improves aeration – prevents compaction and allows mycelium to breathe
Multi-purpose use – PF Tek, monotub grows, spawn mixing, and casing layers
Trusted by mushroom cultivators – a staple in mycology labs and home setups
📘 How to Use Vermiculite in Mushroom Cultivation
PF Tek Method: Mix vermiculite with brown rice flour and water to prepare sterilized jars for inoculation.
Casing Layers: Apply a layer of moist vermiculite over colonized substrates to retain humidity and stimulate mushroom fruiting.
Bulk Substrates: Blend vermiculite with coco coir and gypsum to create a high-performing substrate mix.
Spawn Expansion: Use as a hydration buffer when spawning grains into larger bulk substrates.
🔑 Key Features
Volume: 100 litres
Grade: Premium horticultural vermiculite
Use: Substrates, casing layers, spawn hydration
Benefits: Moisture control, aeration, easy handling
❓ Frequently Asked Questions – Vermiculite 100L Bag
1. What is vermiculite used for in mushroom cultivation?
Vermiculite is primarily used as a casing layer, moisture buffer, and aeration agent in mushroom cultivation. It holds water while allowing airflow, creating the ideal microclimate for mycelium and fruiting mushrooms. Growers also mix it with brown rice flour in PF Tek jars, add it to coco coir substrates, or use it to maintain humidity in monotubs.
2. Can vermiculite be sterilized for mushroom growing?
Yes. Vermiculite can be sterilized using a pressure cooker or autoclave, especially when it’s being used in PF Tek jars or mixed with other ingredients like brown rice flour. For casing layers applied after colonization, sterilization is not always necessary, but pasteurization is recommended for best results.
3. Is vermiculite safe for mushrooms?
Absolutely. Vermiculite is a non-nutritive mineral that provides structure, water retention, and aeration. It does not feed contaminants, making it a safe and reliable material for mushroom cultivation. Always use horticultural-grade vermiculite like this product, as it is clean and suitable for mushroom projects.
4. How much vermiculite do I need for bulk mushroom growing?
A 100L bag of vermiculite is ideal for larger projects. For example:
A 100L bag can prepare hundreds of PF Tek jars when mixed with brown rice flour.
When used in bulk substrate mixes (with coco coir and gypsum), one bag can support multiple monotubs.
For casing layers, a single bag provides more than enough coverage for repeated harvests.
5. What is the difference between vermiculite and perlite?
Vermiculite: Holds water and provides aeration, used in casing layers and substrate mixes.
Perlite: Holds less water but provides excellent drainage, mainly used in fruiting chambers to maintain high humidity.
Both are valuable in mushroom cultivation, but vermiculite is the preferred choice for casing layers and substrates.
6. Does vermiculite expire or go bad?
No, vermiculite is a mineral-based product that does not expire or decompose. As long as it is stored in a clean, dry environment, it remains usable indefinitely.
