In agriculture and horticulture, coir is a substitute for sphagnum (peat moss) and peat because it is widely available and environmentally friendly. Many sources of coir however are heavily contaminated with pathogenic fungi, and the choice of the source is important. Coir is also useful to deter snailsfrom delicate plantings, and as a growing medium in intensive glasshouse (greenhouse) horticulture.[11] Coconut coir from Mexico has been found to contain large numbers of colonies of the beneficial fungus Aspergillus terreus, which acts as a biological control against plant pathogenic fungi.[12] Coir is also used as a substrate to grow mushrooms. The coir is usually mixed with vermiculite and pasteurised with boiling water. After the coir/vermiculite mix has cooled to room temperature, it is placed in a larger container, usually a plastic box. Previously prepared spawn jars are then added, spawn is usually grown in jars using substrates such as rye grains or wild bird seed. This spawn is the mushrooms mycelium and will colonize the coir/vermiculite mix eventually fruiting mushrooms. Coir is an allergen, as well as the latex and other materials used frequently in the treatment of coir.[13] Coir can be used as a terrarium substrate for reptiles or arachnids.[14][15] Coir fibre pith or coir dust can hold large quantities of water, just like a sponge.[16] It is used as a replacement for traditional peat in soil mixtures, or, as a soil-less substrate for plant cultivation.[16] It has been called "coco peat" because it is to fresh coco fibre somewhat like what peat is to peat moss, although it is not true peat. Coir waste from coir fibre industries is washed, heat-treated, screened and graded before being processed into coco peat products of various granularity and denseness, which are then used for horticultural and agricultural applications and as industrial absorbent. Usually shipped in the form of compressed bales, briquettes, slabs or discs, the end user usually expands and aerates the compressed coco peat by the addition of water. A single kilogramme of dry coco peat will expand to 15 litres of moist coco peat. Coco peat is used as a soil conditioner. Due to low levels of nutrients in its composition, coco peat is usually not the sole component in the medium used to grow plants. When plants are grown exclusively in coco peat, it is important to add nutrients according to the specific plants' needs. Coco peat from Philippines, Sri Lanka and India contains several macro- and micro-plant nutrients, including substantial quantities of potassium. This extra potassium can interfere with magnesium availability. Adding extra magnesium through the addition of magnesium sulphates can correct this issue. Some coco peat is not fully decomposed when it arrives and will use up available nitrogen as it does so (known as drawdown), competing with the plant if there is not enough. This is called nitrogen robbery; it can cause nitrogen deficiency in the plants. Poorly sourced coco fibre can have excess salts in it and needs washing (check electrical conductivity of run-off water, flush if high).
Anakaputhur, Thanjavur, Tamil Nadu 
