Worm poop, or "castings," are known as the richest natural vermicompost out there. Our Worm Poop is a single-sourced, US-grown casting "bred with love" using responsible practices-fore a consistent, quality casting that improves soil structure and nutrient uptake. Chemical-Free - worms are fed a diverse diet of organic and all-natural fruits and vegetables. The food waste is diverted from landfills via Austin's Zero-Waste Landfill initiative.