Normally, I do weekly sprays of a weak orchid fertilizer but I'm pretty leary about using ground fertilizers. About 6 months ago though, I decided to put about 3 pellets of osmocote in each pot and though I have no controls, it didn't seem to harm them either. Tonite, I re-fertilized all the neps in the hopes that I'll see good growth. I'd like to hear how others feel about using osmocote and other time-release fertilizers on your neps.