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Mushroom Substrate UK
Grain Spawn vs Bulk Substrate
Mushroom substrate comes in two main forms, and most grows use both. Grain spawn (rye or brown rice flour) colonises fast and gives mycelium something easy to run through before it hits the bulk substrate, which is where the actual flush happens. Our Sterilised Rye Grain Bags come ready to inoculate with an injection port already fitted, while Brown Rice Flour bags suit PF Tek style jars for beginners working with smaller batches. Once your grain spawn is fully colonised, mix it through a bulk substrate to multiply your yield rather than trying to fruit straight from grain alone.
Bulk Substrate and Casing
For bulk substrate, our Horse Manure Based Mushroom Substrate comes ready to use straight from the bag, no pasteurising or mixing required, which makes it a solid choice if you want to skip the prep work. Once your bulk tub is colonised, a casing layer helps hold moisture at the surface and encourages a stronger, more even flush. Our Sterilised Vermiculite is sold ready-sterilised in 1 litre bags, so you can cap a tub without worrying about introducing contamination through unsterilised casing material.
Shop All Mushroom Substrate
Not sure which substrate suits your grow? As a rough guide: rye grain or brown rice flour for spawn, horse manure based substrate for an easy bulk tub, and vermiculite for casing once it's colonised. Browse the full range of sterilised rye grain, brown rice flour, horse manure substrate and vermiculite below and get everything sorted in one order.