Leo in N E Illinois
The Professor
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Any peat can be used in muck, including coconut peat (coir) which is a far more renewable product than sphagnum peats.
Sphagnum may provide fibres to hold muck together but IMHO its main reason is to absorb moisture. When sphagnum free much dries out it is extremely difficult to rewet. Sphagnum fibres absorb water and spread it through the muck and the whole mass soon absorbs water again. Hair and raffia will provide some fibre but will they also help absorb water if the mix dries out?
In the subtropics, and tropics, where coconut is an economic crop, coir is great IF it has been adequately soaked and rinsed in fresh water to eliminate salt. Some parts of the world, especially Indonesia use sea water to process their coir. A soaking in fresh water with several changes over a month long period will eliminate the sea salt. There are some good companies that will guarantee that their coir is free of sea salt.
In the USA, when coir first became a fad salt was a problem. There is (? used to be?) a company just north of Saint Louis on the Missouri side of the river that imported a very nice, salt free version of coir. I believe the name of the company was Crystal Products or Crystal Horticultural Products. I no longer remember, as it has been a decade since I last bought coir.