Cymbidium lancifolium in situ
 

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I went mountain climbing several days and saw some wild plants of this species.

That's real cool!

This is a semi-terrestrial right?

It looks like it's growing in the soil with some broken branches and leaves.

Do you happen to know if it's growing on any kind of limestone hill?

Philip,
The wild plants I have ever seen are terrestrial but their roots are not deep in the soil.
They are usually found in deep forests without direct sunlight exposure.
Here, this species does not grow in the limestone area.