Miracle-Gro® Expand 'n Gro® Concentrated Planting Mix is a great substitute for potting mix or garden soil as it can be used in-ground or in containers. The compressed coir with plant food expands up to 3X when water is added. Its formulation also feeds plants for up to 6 months and holds up to 50% more water than basic potting soil. This all-purpose mixture makes your soil lighter and creates up to 90% more air space giving your plant's roots all the room they need to thrive. Water the product on first use to ensure full expansion. After the initial planting, you may water as usual. Packaged in a small, manageable, lightweight bag, Miracle-Gro® Expand 'n Gro® Concentrated Planting Mix is a convenient way to get your garden project started. It's a lighter soil for a stronger garden. One 0.33 cu. ft. bag covers 4 sq. ft. or can be used when planting two 12" pots.