Gardeners can make sure indoor plant roots get as much air as they need with Organicare Pure Earth Air Indoor potting soil. Composed of Organicare Humex, Seaplex and Pure, as well as coco coir, perlite, earthworm castings and more, it’s made to help plants thrive. This high-porosity, all-natural growing medium possesses the perfect air-to-water ratio for plants grown inside, though it’s also a great choice for outdoor plants that require a high level of root aeration. 30-pound bag.