We 
Hydroponics
...Soil Gardening lovers would find this material quite familiar as an excellent moisture nutrient retaining, and organic soil-softening durable material... What is this 
PEAT MOSS
...Peat moss is a dead 
fibrous material that develops in a wet, 
cold, 
acidic, and lack-of-air 
environment called peat bogs. In that environment, sphagnum moss and other living things decompose into a dense dark brown compact. This is the peat moss. 
This process takes place so long, even a few thousands of years. So peat moss is not considered a renewable medium, and not friendly to the environment...
Read more about peat moss here 
