Looks to me like it might need some water. How long has it been on the rock - is there any root system in the 'ground'? What are you doing in terms of that, and humidity, and what did you use for soil? It's a Schefflera, and while it likes to dry out between waterings in a pot, it might need more the way its growing (or not, depending on above answers).

It appears as though your plant is suffering from an extreme accumulation of soluble salts in the media surrounding the roots. I would flush flush flush flush (getting the idea?) until you're sure you've rid the soil of the excess salts.

Imagine how curing salt 'pulls' the water out of meats and fish ..... and you're imagining what's occurring with your plant. It cannot take up water because there is a state of isotonicity, or even hypertonicity, between the solute level in cell cytoplasm and the soil solution.

Al

Here is a link that might be useful: Watch the movie

Great info Al~

I knewsalts were harmful, but never really thought about why or how.

Thanks!
JJ