Organic GreenSand 0-0-0.1 is a mined mineral, rich in the soil-conditioning element Glauconite. Acts as a soil conditioner for organic gardening. Contains 6% total potash. 0.1% available immediately. Rich in trace elements. All natural, non-burning, purest Greensand obtainable. Glauconite deposits are of marine origin and are composed primarily of ironpotassium silicate, which gives it it's bluish green color. Potassium is an essential nutrient needed by all plant life. Other valuable properties of Espoma Greensand are it's ability to loosen clay soils, bind sandy soils, and increase the water holding capacity of all soils. It is an exceptional soil conditioner for flower beds, gardens and lawns.