Happy Frog Potting Soil from Fox Farm is amended with soil microbes & mycorrhizae that can help improve root efficiency and encourage nutrient uptake. Between the perlite, peat, earthworm castings, bat guano, and aged forest soil and humus, your container plants have never felt so good. Garden tip: Happy Frog Potting Soil is designed for container planting for houseplants and indoor or outdoor garden plants. One of the very best potting soils on the market. We sell multiple sizes, though photo shows only one size.