Growstones are a horticultural, scientific and environmental win-win-win. They are a breakthrough substrate environmentally engineered from discarded glass. Never strip-mined or shipped long distances like perlite or Hydroton they help create happier plants and a healthier planet. Growstones are highly porous, chemical and toxin-free hydroponic growth mediums and soil aerators engineered to deliver superior air and water retention ratios for superior plants. They can be customized to fit a wide range of plants and climates as well as different growing systems.