Mix equal amount of pumice and perlite (1 part in total) with 3 parts potting soil to enhance the drainage and aeration of the planting medium. These materials are also suitable for top dressing bonsai, cactuses, and succulents. Sprinkle them on the surface of the growing medium and gently work them into the soil. Many growers also mix these ingredients together and grow their drainage-loving plants in that blend. Finally, these inorganic materials are great for hydroponic gardening, as they'll support the roots of your green buddies.