Vermiculite is produced by heating a mica-like mineral. It is a sterile material that has the ability to retain moisture in the soil and also contributes to good air supply. It can be used pure or mixed with peat, sand, or soil. It is mainly used for covering in connection with seed sowing. When mixed with peat and soil, it provides an airy and warm soil. Neutral pH. Size: 2-4 mm Sold in a full bag of 100 liters. This item is a special order. Delivery time 1-2 weeks.