Lights/temps/+?
I know lighting and temps are factors, I'm just thinking there is more to it.
Maybe pH and humidity of the substrate?
Or maybe mineral concentration of iron, magnesium or aluminum in the substrate?
Or maybe pH has an influence on availability of certain minerals in the substrate and it is the combination of pH and minerals?
I think we have a lot of things to examine before finding out.
Coloration of Cephalotus seen on pictures in the Internet may also be influenced by Photoshop, I think.
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