Fafard 1 cu. ft. Ultra Container Potting Mix. This specially formulated soil mix is ideal for outdoor containers, including hanging baskets, window boxes, planters, and containers. It contains MoisturePro water-holding crystals that help to drain rapidly during rainy days yet hold enough water to nurture plants through dry, windy days. The mix also includes an extended-release fertilizer that feeds plants for up to 6 months. Regionally formulated from organic materials, it contains Resilience, a patented growing mix enriched with silicon for stronger plant stems and improved root mass.