FoxFarm understands that a potted plant needs more help than others, leading the company to develop its Happy Frog Potting Soil. It's unique base of aged forest products, bat guano and earthworm casting is supplemented with soil microbes to help improve root efficiency and get the most out of its limited space. Founded in 1984 out of a desire to make garden soils that were not sterilized, FoxFarm has developed a line of all-natural soils that help your plants come alive. each bag fills 12 quarts.