The leaves are a year old, no new leaves at all in that time, and my othe citrus have flushed once or twice. No leaf drop, nothinge new. Just sits there like a plastic plant. It is in a 12" pot and the roots are not to the edges of the pot. I did dump it out to check the soil and roots, and the soil is fluffy and moist but not overly wet. The citrus nutritional spray has magnesium in it, so it should be getting enough. Doesn't seem to be planted too deep, I can see the collar on the trunk.
Hmmm, maybe I should sing to it. That's about the only thing I haven't tried. I might try sitting it right under a light?