Vermiculite is a natural mineral that is often placed in potting soil to enhance a plant’s growth by boosting aeration while encouraging water drainage. Vermiculite also adds a plethora of nutrients to the plant, including calcium, magnesium, and potassium. This mineral looks like specks of grey and can easily contain large quantities of air and water.

This mineral looks like specks of grey and can easily contain large quantities of air and water.