Coco coir is a natural, fibrous material made from the outer husks of coconuts. It is widely used in gardening as an eco-friendly, sustainable substitute for peat moss, helping to retain water, improve soil texture, and promote healthy root growth.Coco coir is manufactured using fiber that’s torn from coconut shells. The tiny grains of coir is extracted from the coconut shell and pulverized into a packable growing substrate. First, the coconuts go through the retting process, a curing method that naturally decomposes the husk’s pulp. Traditionally, coconut husks were immersed in water for six months or longer to decompose. Today, the retting process can be completed in a little over a week using modern mechanical techniques.