Our premium Sunshine^® Container Potting Mix is formulated for outdoor container gardening, whether you are planting in pots, window boxes, and large patio containers. And, because it contains water-holding crystals and control-release fertilizer that feeds plants for up to 6 months, it will care for plants all summer long. It also contains Canadian sphagnum peat moss, RESiLIENCE^®, perlite, and other fertile ingredients.