Vermiculite is the mineral Mica, super-heated to expand much like an accordion. This mineral is other used in soil mixes to increase water holding capacity. Many growers use vermiculite in their flats in order to create a micro environment that will protect seeds from air currents and insulate the seeds to provide uniform germination temperatures.
- Lightweight
- Inert
- Neutral pH
- Increase water retention
- Sterile