I use Turface and really like it..... things just seem to grow very well in it... no scientific studies, just observations. I actually use it as an incubation substrate for reptiles, and the stuff we plant with is a byproduct from the gecko farm. I think it would be a bit expensive to use in anything larger than a four inch pot. It runs $10.00 for a #50 pound bag. It holds a LOT of water without feeling "wet". We have grown a lot of small aloe and agave in a mix of coir and turface and it performs very well.
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