Ok this should very likely be put in the Vanda section but since its still a part of my vase culture experiments, it's going here.
I bought a new vanda recently (V. Vivan x sanderiana) and it has really long roots-- almost all were viable when I received the plant-- the leaves are a little sad but that will fix itself with time and good culture.
So the problem I ran into is that the vase its in is quite large. I don't remember the dimensions or the volume but when full, it's heavy for sure! So I decided the bottom of the vase would get a hole drilled to drain the vase instead of up-ending it to empty the contents. This did two things-- saved me from having to maneuver with this heavy glass vase full of water and second, it allowed me to put hydroton into the vase-- not much, just enough to cover the bottom, up surface area and thus humidity through evaporation.
The trick worked well but the very bottom roots would stay at the very bottom of the vase while the hydroton would float (and eventually sink as it filled with water) and then the roots would be sitting in water with very wet medium atop them-- ripe for root rot. So I needed a way to control the hydroton.
I took screening-- the kind you put in your window to keep out bugs-- and cut two circular patterns, sewed them up, flipped the whole thing inside-out (think of how you make a pillow) and then filled it with the hydroton I wanted at the bottom. I then sewed that hole shut.
Placing the pillow of hydroton at the bottom does three things-- keeps the lowest roots from sitting in water-- still provides the vase with a lot more surface area for evaporation and lastly, it keeps the hydroton in place, at the bottom where the lowest part of the pillow can sit in water and draw from it throughout the day as water evaporates.
I also took hydroton and placed it inside the vanda's basket-- they're too big to fall through to the bottom and having them about the roots at the top gives more humidity locally at the top.
I just did this so this is the beginning of the experiment. For now, I'm watering the plant twice a day with my waste ro/di water with a pinch of fert in the water. So far the roots have plumped up really well and I may be able to go to a once-a-day watering (hoping!!!!!).
Here are the photos.