Vermiculite — Ingredient sheet

Vermiculite

Heat-expanded mineral, light and very absorbent, sold as a horticultural substrate.

Characteristics

• Holds water and air; almost no nutrients.
• Used as a carrier to multiply mycorrhizal fungi, mixed with compost (Rodale Institute, USDA-ARS method).

Role in the preparation: Seed-starting substrate and carrier for producing mycorrhizal inoculum.

Caution: Dust: moisten before handling and wear a mask; choose horticultural vermiculite guaranteed asbestos-free.

Sources: Rodale Institute – How to inoculate arbuscular mycorrhizal fungi on the farm (méthode USDA-ARS, Douds et al.)

Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.