While it was fine at the beginning when I only had couple, quickly it became a chore - when number of vandas grew up to thirteen.
I tried several of them in the clay pot with chc and it seems to be working.
So I made a transfer.
If roots system is good - I just curled roots into a clay pot and added a handful of chc. When there is not much of roots, I tied plant to plastic vanda basket, added chc there and put basket into pot.

Now I have only Vanda tessellata in a glass vase because her roots are too awkward to fit into pot.
