Diatomaceous Earth is a naturally occurring sedimentary rock, consisting of fossilized remains of diatoms - silica-rich, single-celled algae. This soil amendment encourages the retention of water and nutrients while draining freely and allowing high oxygen circulation within the growing medium.
To help improve soil structure and water holding capacity, apply 500 grams per m2 of area (1 lb per 10 ft2), and mix thoroughly into the soil. Apply once per year.