Vermiculite 1L bags are now available at Alchimiaweb.com. They are ideal for preparing mushroom breads. With 1 liter of Vermiculite you can prepare up to 5 1200ml loaves.
Vermiculite is used to cover the grain inoculated with Psilocybe mushroom spores. It maintains and retains moisture, facilitating the sprouting and sustaining the adult mushrooms.