Plan B Organics Volcanic Rock Dust provides key building blocks for healthy soil. It is sourced from a geographical location near the equator in an ultra-rich, tropical microclimate in Indonesia and is bountiful in trace and essential minerals that plants need to thrive. Volcanic Rock Dust is a slowrelease product of super-fine particles that are passed through a 200-mesh screen for consistency. It helps promote a strong root system, improve water retention, and improve microbial activity that leads to stronger, healthier, more productive plants. It is an ideal tonic for wormeries and can be used in gardens, containers, and raised beds for vegetables, fruits, herbs, flowers, vines, trees, and shrubs.