Foxfarm 2 CUFT Coco Loco Potting Mix. This all-purpose organic potting soil mix is made from coir, a natural fiber that holds more than its weight in water while still draining well. Coir behaves like little sponges, offering nutrients and water as needed by the plants. Lower humidity reduces the possibility of attracting mold and root rot, while insects are less likely to bother potted plants.