Weekly update (OK, it's been a little more than a week....)
#1: no new growth, but roots greening up and pseudobulbs plumper since doing the "humidity tent" (aka vented plastic bag) a week ago. Loss of multiple leaves (yellowed and dropped) from backbulbs, no signs of crown or root rot (leaf loss possibly part of normal growth cycle or due to stress?).
#2: leaf on first lead developing, second lead continuing to grow, two leaves yellowing and probably will drop soon (possible normal growth cycle?). Pseudobulbs plump, no signs of rot anywhere.
#3: one leaf yellowing (possible normal?), everything else apparently healthy. Pseudobulbs plump, roots green.
So, #1 continues to struggle, and the multiple leaf loss from the backbulbs is a concern. Good news for #1 is that the roots are greening up and the pseudobulbs are filling out with the increase in humidity.
#2 still seems to be doing the best so far, with healthy new growth and that I hope is a normal loss of two leaves on the backbulbs. #3 is doing far better than #1 but not as well as #3.
I did take some time this week to look at pix of E. polybulbon in the wild (thank you IOSPE!) and I find it interesting that every one of the ones I found showed them with their roots growing over and through a shallow layer of live moss on the bark of trees. To me this indicates that they have fairly constant moisture (either via daily rains or dew) and high humidity most of the time--which explains why #2 is doing best....
Catherine
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