Grow healthier plants with Merrill's specialized Organic Potting Mix. Merrill’s Potting Mix is a high quality mix that's completely organic. It is formulated to work for use in pots and raised planting areas. Merrill's potting mix is made from premium compost, peat moss, aged pine fines and perlite–and then enhanced with endomycorrhizae, which are naturally occurring fungi responsible for higher nutrient absorption, fast root establishment and long-term improved soil. Merrill’s focuses on using only select ingredients and closely monitors quality to ensure consistency and quality.