Coconut coir is rapidly becoming the media of choice for both passive hydroponic and soil-based gardeners, who are concerned with the depletion of rare peat bogs. It is a waste material from coconut production and is sustainable. Due to the structure of this growing media, it means that it allows for better drainage and air retention.
Coco coir has usually been pre-treated or washed to help eliminate the high levels of salts that can be found in this media. Naturally, coco coir has a slightly acidic pH and holds practically no nutrient content of its own, apart from potassium. Due to the natural breakdown process, coco coir naturally lets go of potassium, which is one of the main nutrients plants need and so, it is important to use a coco specific nutrient, as it compensates for this.