Potash is a naturally occurring mineral created during the evaporation of ancient sea beds. Potash is also referred to as Muriate of Potash or Potassium Chloride and is the most widely used potassium fertilizer. Potassium is one of the three primary crop nutrients required for plant growth. Potassium serves as the “Regulator” of many essential processes within the plant. Potash is water-soluble and contains 60-62 percent K2O. Mosaic potash products vary in color from red to white and are available in several sizes, providing choices for most application options. To learn more, select a potash fertilizer product from below.