That was my thought, too, Ursula from seeing Glen's pictures. I'd definitely add some water and fert to that Vanda's diet, but . . hey it's blooming! Can't be too awfully distressed.
We have both Eucalyptus and Melaleuca (unfortunately invasive) here in Florida. Both are widely used as mulch, and both are touted as being relatively insect-resistant because of their aromatic oils. I don't know about the aromatic oils damaging epiphytic plants but they sure don't seem to affect any terrestrial plants.
But must say, I've never seen epiphytes growing on either of those trees, that I can recall. Maybe only because they have relatively smooth bark and the epiphytes attach better or find more amenable environs on rougher bark.
