GAIA GREEN Basalt Rock Dust is mined from an ancient volcanic deposit in British Columbia, Canada. It is a source of natural minerals and trace elements that plants need to thrive. This product can be used on farms, home gardens, landscapes and turf, for a full range of plant types. Basalt is a mineral-rich, volcanic rock high in magnesium, iron, calcium and silica. Finely ground rock dust to rapidly re-mineralize depleted soils and potting mixes. Contains a wide-range of trace elements to support both plant growth and soil biological activity.