Bulk mushroom substrate is used after grain spawn colonisation to support healthy fruiting and consistent yields. This category brings together ready-to-use bulk substrate options designed for growers who want reliable performance without mixing individual ingredients.
Our bulk substrate range includes coco coir–based blends and manure-based substrates commonly used in monotubs, trays, and other bulk growing setups. Each product is prepared to provide balanced moisture retention, airflow, and structure across a wide range of cultivation workflows.
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Bulk substrate forms the main fruiting medium for mushrooms once grain spawn has fully colonised. It supplies the moisture, structure, and nutrients required for strong mycelial development and reliable fruiting.
Bulk substrates are typically used in monotubs, trays, and bag-based systems where consistent hydration and airflow are essential.
This category may include:
Coco coir-based bulk substrate blends
Manure-based substrates such as horse manure mixes
Other ready-to-use bulk substrate formats
Each product listing includes detailed information on composition, weight, and intended use.
When selecting a bulk substrate, consider:
The mushroom species being grown
Whether a coco coir–based or manure-based substrate is preferred
Container type (monotub, tray, or bag)
Moisture retention and airflow requirements
Refer to individual product pages for exact specifications and usage notes.
You may also want to explore:
🔗 Sterilised Grain Spawn Bags
🔗 Monotub Growing Kits
🔗 Mushroom Incubators
Want to make your own?
Bulk Substrate Recipe for Mushrooms (Ultimate Guide) – Spore Buddies
