What is it?
Greensand is a sand or sandstone that has a green color to it. It is formed from organic sediment in marine environments. It contains a high percentage of the mineral glauconite (an iron potassium sillicate) which is greenish black/blue.
What is the primary benefit?
Potassium in a water-soluable form called potash. While the main component of greensand, the mineral glauconite, is not readily water soluble, it will eventually erode and slowly release the potassium into the soil.
How is it used?
It can be added to the soil at anytime of the year. It is typically sprinkled over the surface of the soil, or it can be worked/blended into the soil.
If you soil has adequate potassium levels: 25 lbs per 1,000 square feet
If you soil has medium potassium levels: 50 lbs per 1,000 square feet
If you soil has low potassium levels: 100 lbs per 1,000 square feet
NPK Ratio: 0-0-7
7% potash (potassium)
32 trace minerals