I initially envisioned this because my
Microchilus tridax got stem rot in my jewel and begonia bowl. The vendor said that Microchilus likes less moisture than other jewels, and I’ve seen some pics of it growing very happily on lava rock. Currently I’m trying to rescue the one whose stem rotted, but I have another coming soon.
I also had two paphs, thaianum and ‘QF Mini’ (a thaianum hybrid) that just weren’t thriving. They are lithophytes that grow on limestone cliffs and like added calcium in their mix.
So far I have created a little lava rock cliff, and put the paphs in pockets at the top in ABG mixed with crushed coral for calcium. I’ll put the Microchilus in the bottom when it arrives.
I may also try
Begonia hoehneana in this at some point, it is supposed to grow on “calcareous rocks” in the wild.