Lin, yes I've been reading about the humidity and air flow and I'll set them outside on the covered porch once the temps are more stable and see how they like it.
Audrey and Laurelca, there was 1/2" -- 1" space around the base of the Xerographica in the vase. It wasn't tight but that may have been restricting air flow to it's bottom. I moved it to a new holder that should allow it plenty of air flow now. Also moved it to a plant stand that gets more bright indirect lighting till I can put it outside. :)
