Greensand Soil Additive (5 Pounds); Special Container Gardening AdditiveBrand: Soil Sunrise Features: Natural Soil Conditioner Derived from marine mineral deposits, this has been used as a soil improver for centuries. Benefits: Adds mineral to soil, improves moisture retention, rich source of glauconite, softens hard water, increases root growth Super Soil Additive Green sand is a great additive for multi use soils, with a bio availability of 12 14 months. Even after multiple cycles, the benefits of the sand are still