Jim, no, I have not. Not sure exactly what Iron will do.
Ok here is a link, I see.
http://www.ext.colostate.edu/p...
No, I have never worried about Iron deficiency in my Orchids, but Magnesium addition (Epsom salt) will give your Orchids nice green leaves.
See the Magnesium in the center of the Chlorophyll molecule? Chlorophyll is what makes your leaves green.
