Vermiculite is an organic, asbestos-free soil amendment that promotes faster root growth and gives quick anchorage to young roots. It helps retain air, plant food and moisture, releasing them as the plant requires them. Mixing vermiculite in flower and vegetable gardens or in potted plants will provide the necessary air to maintain Vigorous plant growth. To care for plants and lawns - where soils are sandy, mix vermiculite into the soil, as this will allow the soil to hold water and air needed for growth.