Better than both is coco chips - exported in mass from India but hard to get in Mumbai. This is compressed coconut waste material - you may have also heard of coco peat. These products are easily available in Kerala, in Mumbai earlier there was one stockist but now he has moved.
I have cultivated orchids (strictly amateur) for many years. To be honest, you can tie an epiphytic orchid even to a metal or plastic pole and the roots will grasp these poles quite happily. The sine qua non for epiphytes is perfect drainage. The nurseries sell orchid plants in little pots having multiple cut-outs all over, in these pots you will usually find charcoal chips. Nothing hard and fast about it. You could tie your orchids with coir twine on dry coconut shell or any piece of rough bark, rough plywood etc. As I said, some of the orchids in my terrace are quite happy growing on metal pipes and plastic pipes or the branches of other shrubs!!! Especially if you tie them at the beginning of the monsoons, they will adapt to just about anything. BTW, I dont use any fertiliser either and my orchids are flowering regularly without complaint!
Which is best for orchid cultivation - coal or charcoal?
Since Coal Is a form of Petroleum, I would think you would use CHARCOAL, How about you?
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