This seed starter mix contains Pro-Biotic, the same combination of selected strains of beneficial microbes with endo and ecto mycorrhizae proven so effective in organic fertilizers. ProMoisture Hydrate, made with aloe vera, keeps micro-organisms moist, protected and alive, even when exposed to exposed to extreme hot and cold temperatures. 100 Percent natural. Use in seed flats or containers to start all seeds. Comes with 12-quart.