Miracle-Gro Organic Outdoor Potting Mix 25qt Compost boosts water and nutrient retention, and quick-release natural fertilizer and naturally derived nutrients provide both immediate and slow-release nutrition. Responsibly sourced sphagnum peat moss (100% of peat sourced from certified producers) helps retain and release water. This potting mix is for use with all types of outdoor container plants, including flowers, vegetables, herbs, annuals, and perennials.