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Re:Growing a mango tree from seed – one year time lapse [video] by pimlottc on Saturday February 12, 2022 @10:09AM (#30313332)
Coconut coir is also known as coconut fibre; it’s the springy material you get from inside the shell when you husk a coconut. I had never heard the term before and had to look it up.

https://en.m.wikipedia.org/wiki/Coir

Re:Growing a mango tree from seed – one year time lapse [video] by InvaderFizz on Saturday February 12, 2022 @10:49AM (#30313646)
I wonder if this is the reason the GP has such luck with it. From the linked Wikipedia article:

> Trichoderma is a naturally occurring fungus in coco peat; it works in symbiosis with plant roots to protect them from pathogenic fungi such as Pythium. It is not present in sterilised coco peat[citation needed].