Efforts to decrease the disposal of agricultural residues and develop new applications are being given prominence across the world. The concept of circular economy and “No Agricultural Waste” are being aggressively pursued. Using agricultural residues for agricultural purposes seems to be the most prudent approach. Coir and other coconut by-products have been studied for several agricultural applications including soilless growing media, mulching for crops, restoration of banks and streams feeding agricultural fields, etc. Despite such wide applications, there are many more avenues where coir and its by-products can be utilized. This chapter provides an overview of the applications of coir and coir by-products in agriculture, particularly the coir and coir dust as soilless growing media.